'.',⍨¨ ','(≠⊆⊢)'abc,123,X' ⍝ [1] Do the split: ','(≠⊆⊢)'abc,123,X'; [2] append the periods: '.',⍨¨
abc. 123. X. ⍝ 3 strings (char vectors), each with a period at the end.