Table:
0
A
B
C
D
E
F
G
H
1
Name
Year Began
Registration
Userpics Free
Userpics Paid
Monthly Cost for Paid Account
Yearly Cost for Paid Account
Permanent Account
2
Academ
2006
Open
Unknown
Unknown
Unknown
Unknown
Unknown
3
BlogEnglish
2007
Open
Unknown
Unknown
Unknown
Unknown
Unknown
4
BlogOnline
2005
Open
Unknown
Unknown
Unknown
Unknown
Unknown
5
BootieJournal
2003
Invite-only
Unknown
N/A
N/A
N/A
N/A
6
Caleida
2003
Open
3
100
2.5 USD
20 USD
N/A
7
CommieJournal
2007
Open to people 18 and over
100
500
5 USD
20 USD
75 USD
8
CrazyLife
2003
Open to people 13 and over
Unknown
N/A
N/A
N/A
N/A
9
GreatestJournal
2003
Disabled
100
N/A
N/A
N/A
N/A
10
Inksome
2007
Invite-only or paid
150
300
3 USD
25 USD
120 USD
11
Isurgut
2004
Open
Unknown
Unknown
Unknown
Unknown
Unknown
12
IziBlog
2004
Open to people 13 and over ( OpenID )
150
N/A
N/A
N/A
N/A
13
LiveJourbal
2005
Invite-only or paid ( OpenID )
15
100
N/A
N/A
25 USD
14
LiveLogCity
2003
Open
1
N/A
N/A
N/A
N/A
15
LostJournal
2005
Invite-only or paid ( OpenID )
3
15
Unknown
Unknown
Unknown
16
Minilog
2002
Open
Unknown
3000 (6000 for permanent accounts)
Minimum 2 months, 3 GBP or 5.50 USD
15 GBP or 28 USD
65 GBP or 121 USD
17
Needless Panic
Unknown
Unknown
Unknown
Unknown
Unknown
Unknown
Unknown
18
OpenWeblog
2005
Unknown
Unknown
Unknown
Unknown
Unknown
Unknown
19
uJournal / AboutMyLife
2002
Suspended
Unknown
Unknown
Unknown
Unknown
Unknown
20
Name
Year Began
Registration
Userpics Free
Userpics Paid
Monthly Cost for Paid Account
Yearly Cost for Paid Account
Permanent Account

Questions and formulas:
Question: Which permanent account has registration of invite-only and userpics free of unknown?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:H1,(D1="unknown")*(C1="invite-only")),8))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:H20,(D2:D20="unknown")*(C2:C20="invite-only")),8))
Level: medium
Question: What is the year began for the site with free userpics cost of $1 and a userpics paid value of N/A?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:H1,(E1="n/a")*(D1="1")),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:H20,(E2:E20="n/a")*(D2:D20="1")),2))
Level: medium