a # 1 60 R ' z#numblankcols a                                           '
a # a,[1]  ' a#&`/'' ''=Fmatrix a                                         '
a # a,[1]  ' z#(Ra)|(_Lio)+(aI0),(`Oa)I0                                '
a # a,[1]  ' $0                                                         '
a # a,[1]  '"numblankcols - counts blank columns at sides of structure  '
a # a,[1]  '"from ''the apl handbook of techniques'' copyright 1978, ibm. '
a # a,[1]  '"-returns a two-element vector representing columns of      '
a # a,[1]  '" successive blanks on the left and right side of structure.'
Lfx a