HTML RESULT 
{sequence 25, push='mySequence'}
{pull mySequence, make,   step=4} {$sequence} {/pull}
1 5 9 13 17 21 25 29 33 37 41 45 49 53 57 61 65 69 73 77 81 85 89 93 97
{pull mySequence, keep,   step=4} {$sequence} {/pull}
1 5 9 13 17 21 25
{pull mySequence, remove, step=4} {$sequence} {/pull}
2 3 4 6 7 8 10 11 12 14 15 16 18 19 20 22 23 24
{pull mySequence, flag,   step=4} {$sequence} {/pull}
1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1