<!-- BEGIN loop -->
<!-- IF loop.S_FIRST_ROW -->first<!-- ENDIF -->
{loop.S_ROW_NUM} - a
{loop.VARIABLE} - b
<!-- IF loop.VARIABLE -->set<!-- ENDIF -->
<!-- IF loop.S_LAST_ROW -->
last
<!-- ENDIF -->
<!-- BEGIN inner -->
{inner.S_ROW_NUM} - c
<!-- IF inner.S_LAST_ROW and inner.S_ROW_COUNT and inner.S_NUM_ROWS -->last inner<!-- ENDIF -->
<!-- END inner -->
<!-- END loop -->