added cases to exploit O(n) space or/and time implementaion
	modified:   tests/chap2/q0002.py
Merge branch 'upstream'
oops K, M, G etc, not Ki, Mi, Gi.
	modified:   tests/chap2/q0002.py
Merge branch 'upstream'
yet another.
	modified:   tests/chap2/q0002.py
Merge branch 'upstream'
oh, poor.
	modified:   tests/chap2/q0002.py
Merge branch 'upstream'