initial
Values are [5:0]:    5, 4, 3, 2, 1, 0
Packed values are: 543210
shift 9 in at 0
Values are [5:0]:    4, 3, 2, 1, 0, 9
Packed values are: 432109
shift 10 in at 0 
Values are [5:0]:    3, 2, 1, 0, 9, a
Packed values are: 32109a
shift 1 in at 0
Values are [5:0]:    2, 1, 0, 9, a, 1
Packed values are: 2109a1
shift 1 in at N
Values are [5:0]:    1, 2, 1, 0, 9, a
Packed values are: 12109a
shift 6 in at N
Values are [5:0]:    6, 1, 2, 1, 0, 9
Packed values are: 612109
shift f in at N
Values are [5:0]:    f, 6, 1, 2, 1, 0
Packed values are: f61210
foo of 0 is 0
take from 16
Values are [5:0]:    5, 4, 3, 2, 1, 0
Packed values are: 543210
take Take from 16
Values are [5:0]:    f, e, d, c, b, a
Packed values are: fedcba
take from 16 at 1
Values are [5:0]:    6, 5, 4, 3, 2, 1
Packed values are: 654321
take from 16 at 7
Values are [5:0]:    c, b, a, 9, 8, 7
Packed values are: cba987
take from 16 at 7
Values are [5:0]:    f, e, d, c, b, a
Packed values are: fedcba
Index 1 of foo is b
Index 3 of foo is d
Index 5 of foo is f
Index 7 of foo is a
Index 1 of foo is b