KeepRemoveFlag/powerful

HTML	RESULT
{sequence 25, push='mySequence'}
{pull mySequence, make, powerful} {$sequence} {/pull}	1 4 8 9 16 25
{pull mySequence, keep, powerful} {$sequence} {/pull}	1 4 8 9 16 25
{pull mySequence, remove, powerful} {$sequence} {/pull}	2 3 5 6 7 10 11 12 13 14 15 17 18 19 20 21 22 23 24
{pull mySequence, flag, powerful} {$sequence} {/pull}	1 0 0 1 0 0 0 1 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1