vars=
!if $cols<=3
 !for i=1 to $cols
  var$i=!item $i of x,y,z
  vars=!append item $(var$i) to $vars
 !next i
!else
 !for i=1 to $cols
  var$i=x$i
  vars=!append item $(var$i) to $vars
 !next i
!endif

