HTML RESULT 
{loop from=10, rows=20}
{pull} {$sequence} {/pull}
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
{pull make='even'  } {$sequence} {/pull}
10 12 12 14 14 16 16 18 18 20 20 22 22 24 24 26 26 28 28 30
{pull keep='even'  } {$sequence} {/pull}
10 12 14 16 18 20 22 24 26 28
{pull remove='even'} {$sequence} {/pull}
11 13 15 17 19 21 23 25 27 29
{pull flag='even'  } {$sequence} {/pull}
1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0