Hudson Lacerda* April 19, 2022 3:46pm bustrophedon ← {(((1↑⍴⍵)⍴0 1)/⍳1↑⍴⍵){,⍵[⍺;]←⌽⍵[⍺;]}⍵} M ← 4 5 ⍴ 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' ,((⍴M)⍴ bustrophedon M),' ' #apl #bustrophedon