<HR> Assign Index from 0, then Auto assign
KEY: 0, VAL: a
KEY: 1, VAL: b
KEY: 2, VAL: c
KEY: 3, VAL: d
KEY: 4, VAL: e
KEY: 5, VAL: f
count(): 6
<HR> Assign Index from 1, then Auto assign
KEY: 1, VAL: a
KEY: 2, VAL: b
KEY: 3, VAL: c
KEY: 4, VAL: d
KEY: 5, VAL: e
KEY: 6, VAL: f
count(): 6
<HR> Assign Index from 2, then Auto assign
KEY: 2, VAL: a
KEY: 3, VAL: b
KEY: 4, VAL: c
KEY: 5, VAL: d
KEY: 6, VAL: e
KEY: 7, VAL: f
count(): 6
<HR> Assign Index from 3, then Auto assign
KEY: 3, VAL: a
KEY: 4, VAL: b
KEY: 5, VAL: c
KEY: 6, VAL: d
KEY: 7, VAL: e
KEY: 8, VAL: f
count(): 6
<HR> Assign Index from 4, then Auto assign
KEY: 4, VAL: a
KEY: 5, VAL: b
KEY: 6, VAL: c
KEY: 7, VAL: d
KEY: 8, VAL: e
KEY: 9, VAL: f
count(): 6
<HR> Assign Index from 5, then Auto assign
KEY: 5, VAL: a
KEY: 6, VAL: b
KEY: 7, VAL: c
KEY: 8, VAL: d
KEY: 9, VAL: e
KEY: 10, VAL: f
count(): 6
<HR> Assign Index from 6, then Auto assign
KEY: 6, VAL: a
KEY: 7, VAL: b
KEY: 8, VAL: c
KEY: 9, VAL: d
KEY: 10, VAL: e
KEY: 11, VAL: f
count(): 6
<HR> Assign Index from 7, then Auto assign
KEY: 7, VAL: a
KEY: 8, VAL: b
KEY: 9, VAL: c
KEY: 10, VAL: d
KEY: 11, VAL: e
KEY: 12, VAL: f
count(): 6