Document:

Exhibit 4.6
                                                                     -----------
                               Amendment Number 6
                                       to
                        PCS U.S. Employees' Savings Plan

         WHEREAS, PCS Administration (USA), Inc. (the "Sponsor") maintains the
PCS U.S. Employees' Savings Plan (the "Plan"), a qualified defined contribution
plan pursuant to section 401(a) of the Internal Revenue Code of 1986; and

         WHEREAS, the Sponsor desires to amend the Plan to suspend employer
matching contributions under the Plan and to include Actual Deferral Percentage
("ADP") testing provisions in the Plan document; and

         WHEREAS, pursuant to Section 12.3 of the Plan, the Sponsor may amend
the Plan at any time, and has authorized its officers to execute this amendment
to the Plan;

         NOW THEREFORE, BE IT RESOLVED, that effective August 1, 2003 the Plan
is amended as follows:

1. Section 1.1 of the Plan is hereby amended by adding the following as the last
paragraph of that section:

         "Effective August 1, 2003, the Plan is no longer intended to meet the
         safe harbor discrimination testing rules of Code sections 401(k)(12)
         and 401(m)(11)."

2. Section 3.5 of the Plan is hereby amended by adding a new subsection (c) to
that Section immediately following subsection (b), to read as follows:

         "(c) Effective August 1, 2003 and for Plan Years beginning thereafter,
         the notice provided for in this section shall no longer be required to
         be provided."

3. Section 4.1 of the Plan is hereby amended by adding a new subsection (c) to
that Section immediately following subsection (b), to read as follows:

         "(c) Effective August 1, 2003, the Matching Limit shall be reduced from
         five percent of the Participant's Compensation to zero percent of the
         Participant's Compensation, and no further contributions shall be
         permitted to a Participant's Matched Before-Tax Contributions Account
         or to a Participant's Matched After-Tax Contributions Account.

         All deferral elections made by a Participant under Section 4.1(a) and
         in effect on July 31, 2003 shall be recharacterized as an election to
         make Unmatched Before-Tax Contributions under Section 4.2(a), and
         beginning August 1, 2003 such amounts shall be contributed to the
         Participant's Unmatched Before-Tax Contributions Account. All deferral
         elections made by a Participant under Section 4.1(b) and in effect on
         July 31, 2003 shall be recharacterized as an election to make Unmatched
         After-Tax Contributions under Section 4.2(b), and beginning August 1,
         2003 such amounts shall be contributed to the Participant's Unmatched
         After-Tax Contributions Account. A Participant may change or suspend
         his or her recharacterized contributions in accordance with the
         provisions of Section 4.4 and Committee rules."

4. Effective August 1, 2003, the Plan shall be amended by deleting the
provisions of Section 4.5 of the Plan. Section 4.5 of the Plan shall be reserved
for future use, as follows:

         "4.5  [Reserved]."

5. Effective August 1, 2003, the Plan shall be amended by adding a new Section
4.7A immediately following Section 4.7, such new section to read as follows:

         "4.7A  Discrimination Limits on Before-Tax Contributions

         (a) In General. For 2003, and prior to the beginning of each subsequent
         Plan Year, and at any other time during the Plan Year that the
         Committee may deem appropriate, the following test shall be made to
         prevent the Before-Tax Contributions under the Plan from becoming
         discriminatory. In accordance with the provisions of section 401(k)(3)
         of the Code and Treasury Regulation section 1.401(k)-1(b), the
         Committee shall gather Before-Tax Contribution elections and shall
         determine whether the average deferral percentage for the group of
         Eligible Employees who are Highly Compensated Employees exceeds that of
         all other Employees by more than (1) 1.25 times, or (2) 2 times, up to
         a maximum difference of 2 percent, whichever results in the greater
         percentage.

         Since this section applies Code section 401(k)(3) using the current
         year testing method, it may not be aggregated under Treasury
         Regulations with a plan that uses the prior year testing method for the
         same testing year.

         (b) Highly Compensated Employee. For purposes of subsection (a), an
         Employee will be considered to be a "Highly Compensated Employee" in
         the current Plan Year if he or she--

                (1) is a 5 percent Owner (as defined in Code section 416(i)(1))
                at any time in the current or preceding Plan Year; or

                (2) for the preceding Plan Year, had Compensation from the
                Employer and Affiliates in excess of $90,000 (as adjusted for
                changes in the cost of living).

         A former Employee will be treated as a highly compensated Employee if
         he was a highly compensated Employee at separation from service, or if
         he was a highly compensated Employee at any time after he attained age
         55.

         (c) Average Deferral Percentage. The "average deferral percentage" for
         each group of Employees for a Plan Year shall be the average of the
         percentages (after any adjustments required under section 4.7),
         calculated separately for each Employee in such group, of Compensation
         each Employee elected to have contributed to the Plan (and any other
         "qualified cash or deferred arrangement" as defined in Code section
         401(k)(2) sponsored by the Company or an Affiliate in which such
         Employee is eligible to participate) as a Before-Tax Contribution for
         the Plan Year, treating a failure to elect any such percentage as a
         zero.

         Any excess contributions for such Plan Year (and any income allocable
         thereto) shall be distributed to the Employees by the close of the Plan
         Year immediately following the Plan Year being tested. For this
         purpose, "excess contributions' shall mean the excess of the aggregate
         amount of deferrals actually made to the Plan on behalf of Highly
         Compensated Employees for such Plan Year, over the maximum amount of
         such contributions permitted under subsection (a) (determined by
         reducing contributions made on behalf of Highly Compensated Employees
         in order of the actual deferral percentages beginning with the highest
         of such percentages.)" Excess contributions shall be allocated to the
         Highly Compensated Employee with the largest amounts of employer
         contributions taken into account in calculating the non-discrimination
         test for the year in which the excess arose, beginning with the Highly
         Compensated Employee with the largest amount of such employer
         contributions and continuing in descending order until all the Excess
         Contributions have been allocated.

         (d) Reductions During Plan Year. If the Committee determines before the
         end of a Plan Year that the limitation of subsection (a) might not be
         satisfied, the Committee may reduce the future Before-Tax Contributions
         of the Highly Compensated Participants such that the amount of a Highly
         Compensated Participant's future Before-Tax Contributions does not
         exceed such contributions of any other Highly Compensated Participant,
         or to the extent permitted by law, in such other manner as the
         Committee may decide.

         (e) Nonelective Employer Contributions. If the Committee determines
         that the limitation of subsection (a) has been or may be exceeded, to
         the extent permitted by regulations of the Internal Revenue Service,
         the Employer may make a contribution on behalf of Non-Highly
         Compensated Employees to satisfy the limitation of subsection (a). Such
         contribution shall be fully and immediately vested and may not be
         withdrawn pursuant to section 7.2 or 7.3 (relating to in-service
         withdrawals)."

         IN WITNESS WHEREOF, the Sponsor has caused this instrument to be
executed on its behalf by its duly authorized officer as of the 30th day of
June, 2003.

                                                 PCS ADMINISTRATION (USA), INC.

                                                 By /s/ Barbara Jane Irwin
                                                    ---------------------------
                                                    Barbara Jane Irwin
                                                    Sr. VP of AdministrationExhibit 4.7
                                                                     -----------

                               Amendment Number 7
                                       to
                        PCS U.S. Employees' Savings Plan

         WHEREAS, PCS Administration (USA), Inc. (the "Sponsor") maintains the
PCS U.S. Employees' Savings Plan (the "Plan"), a qualified defined contribution
plan pursuant to section 401(a) of the Internal Revenue Code of 1986; and

         WHEREAS, the Sponsor desires to amend the Plan to add employer matching
and performance contributions under the Plan and to include an automatic
enrollment feature in the Plan; and

         WHEREAS, pursuant to Section 12.3 of the Plan, the Sponsor may amend
the Plan at any time, and has authorized its officers to execute this amendment
to the Plan;

         NOW THEREFORE, BE IT RESOLVED, that effective August 1, 2004 (except as
otherwise noted) the Plan is amended as follows:

1. Section 3.1(b) of the Plan is hereby amended by deleting that section in its
entirety and adding a new Section 3.1(b), such new section to read as follows:

         "(b) Entry Date and Active Participation/Automatic Enrollment. An
         Eligible Employee who has submitted a completed enrollment form with a
         Compensation Reduction Agreement or a Payroll Deduction Agreement shall
         become an Active Participant on the first day of the first payroll
         period following the processing of such form and agreement by the
         Committee.

         An Eligible Employee who fails to submit a completed enrollment form
         indicating either: (i) his or her level of participation, or (ii) that
         he or she does not wish to participate in the Plan will be
         automatically enrolled and will be deemed to have completed a
         Compensation Reduction Agreement at the level specified in Section
         4.1(c). Such Eligible Employees shall become Active Participants on the
         first day of the first payroll period following the date on which they
         become an Eligible Employee or as soon thereafter as practicable, or on
         such later date specified by the Committee."

2. Sections 4.1(a) and 4.1(b) of the Plan are hereby amended by changing the
words "five percent" to "six percent" each time they appear in those sections,
such that the Matching Limit shall be increased to six percent of the
Participant's Compensation.

3. Section 4.1 of the Plan is hereby amended by deleting the provisions of
Section 4.1(c) of the Plan (as previously added by Amendment 6 to the Plan) and
adding a new Section 4.1(c), such new section to read as follows:

         "(c) Matched Before-Tax Contributions and Account for Participants
         Automatically Enrolled. An Eligible Employee automatically enrolled in
         the Plan as an Active Participant pursuant to Section 3.1(b) shall be
         deemed to have completed a Compensation Reduction Agreement and shall
         have his or her Compensation reduced by two percent while an Active
         Participant. The Employer shall contribute to the Plan on behalf of the
         Participant an amount equal to 100 percent of the amount of the
         reduction in Compensation pursuant to this paragraph. The contribution
         shall be made as soon as administratively practicable but not later
         than 15 business days after the end of the calendar month (or such
         other date permitted by law or regulation) such amounts would otherwise
         have been payable to the Participant in cash in the absence of the
         deemed Compensation Reduction Agreement. The contribution shall be
         credited to the Participant's Matched Before-Tax Contributions
         Account."

4. The Plan is hereby amended by adding a new Section 4.5 to the Plan, which was
previously reserved for future use. Section 4.5 of the Plan shall now read as
follows:

         "4.5  Employer Contributions and Accounts

                (a) Employer Matching Contributions and Account. Subject to the
                limitations of this Article, the Employer shall contribute an
                amount on behalf of each Active Participant equal to Fifty
                Percent (50%) of the Employee's Before-Tax and After-Tax
                Contributions for each payroll period but such Employer Matching
                Contribution may not exceed six percent (6%) of the Employee's
                Compensation while an Active Participant during the Plan Year.
                Effective January 1, 2004, Employer Matching Contributions will
                not be made with respect to catch-up contributions made pursuant
                to Section 414(v) of the Code.

                The Employer Matching Contributions shall be credited to the
                Participant's Employer Matching Contributions Account and shall
                be paid to the Trustee monthly to the extent practicable, but in
                no event later than the earlier of:

                (i) the time required for the filing of the Employer's federal
                income tax return for its fiscal year in which the applicable
                Plan Year ends,

                (ii) 12 months after the close of the Plan Year, or

                (iii) for Employer Matching Contributions relating to Before-Tax
                or After-Tax Employee Contributions made after May 1, 2000, the
                last day of the calendar quarter that follows the calendar
                quarter in which such Employee Contributions were made.

                (b) Employer Performance Contributions and Account. The Employer
                shall make an Employer Performance Contribution to the Plan on
                behalf of all Eligible Employees for each year that certain
                performance goals are met by the Sponsor and Affiliated
                Companies adopting the Plan, but such Employer Performance
                Contribution shall not exceed three percent (3%) of each
                Employee's Compensation while an Active Participant during the
                Plan Year. The performance goals and the related performance
                contribution percentage shall be set by the Board of Directors
                of the Sponsor or its delegates prior to the beginning of each
                Plan Year. Any Employer Performance Contribution shall be
                allocated pro rata among the accounts of Eligible Employees
                based on their Compensation while an Active Participant during
                the Plan Year, and shall be payable to Eligible Employees who
                were actively employed by an Employer on December 31 of the
                applicable Plan Year, or who died, retired, or became disabled
                for purposes of the Plan during the Plan Year.

                To the extent practicable, the Employer Performance Contribution
                shall be paid to the Trustee by the end of the first quarter
                following the end of the Plan Year, but in no event later than
                the earlier of the time required for the filing of the
                Employer's federal income tax return for its fiscal year in
                which the applicable Plan Year ends or 12 months after the close
                of the Plan Year. Employer Performance Contributions shall be
                credited to the Participant's Employer Performance Contributions
                Account."

5. Section 5.1(b) of the Plan is hereby amended by deleting the second paragraph
of that section and substituting in lieu thereof the following:

         "When starting participation in the Plan, the Participant must file an
         investment election in the manner prescribed by the Committee. The
         Before-Tax Contributions and any Employer Contributions made on behalf
         of a Participant who is automatically enrolled in the Plan pursuant to
         Section 3.1(b) shall be invested in the default investment option under
         the Plan. A Participant may change the investment election (whether
         elected or made by default) in the prescribed manner to be effective as
         of the first business day of a calendar quarter or other date
         prescribed by the Committee."

6. Section 7.4(a) of the Plan is hereby amended by deleting the last sentence of
that section and adding the following sentence in lieu thereof:

         "No distribution from the Employer Matching Contributions Account or
         from the Employer Performance Contributions Account may be made
         pursuant to this section."

IN WITNESS WHEREOF, the Sponsor has caused this instrument to be executed on its
behalf by its duly authorized officer as of the 18th day of August, 2004.

                                            PCS ADMINISTRATION (USA), INC.

                                            By: /s/ James H. Heppel
                                                ----------------------------
                                                James H. Heppel
                                                VP Human Resources

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