a # 1 60 R ' t#empty a                                                  '
a # a,[1]  ' t#0=R,a                                                    '
a # a,[1]  ' $0                                                         '
a # a,[1]  '"empty - returns 1 if structure is empty.                   '
a # a,[1]  '"from ''the apl handbook of techniques'' copyright 1978, ibm. '
Lfx a