User blog comment:Edwin Shade/How Do I Evaluate BEAF Arrays In Two Dimensions ?/@comment-30754445-20170827183955/@comment-2600:8802:6600:EE0:98A7:7FC4:8054:ED02-20170827235544

{a,b (1) 1,c} becomes {a,a,...,a (1) {a,b-1 (1) 1,c}, c-1}.