KeepRemoveFlag/triangular

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