KeepRemoveFlag/enneadecagonal

HTML	RESULT
{sequence 25, push='mySequence'}
{pull mySequence, make, enneadecagonal} {$sequence} {/pull}	1 19 54 106 175 261 364 484 621 775 946 1134 1339 1561 1800 2056 2329 2619 2926 3250 3591 3949 4324 4716 5125
{pull mySequence, keep, enneadecagonal} {$sequence} {/pull}	1 19
{pull mySequence, remove, enneadecagonal} {$sequence} {/pull}	2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 20 21 22 23 24 25
{pull mySequence, flag, enneadecagonal} {$sequence} {/pull}	1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0