a # 1 61 R ' h#w cntr v                                                  '
a # a,[1]  '"cntr - used in output function.                             '
a # a,[1]  '"from ''the apl handbook of techniques'' copyright 1978, ibm.  '
a # a,[1]  ' h#(wZRv)/(_S0.5Xw_R,v)`OwYv                                 '
Lfx a