And in SML tuples are just records with numeric fields in a special order. Enter this in the repl: { 1 = "hi", 2 = "howdy" }; And get: val it = ("hi"

And in SML tuples are just records with numeric fields in a special order. Enter this in the repl: { 1 = "hi", 2 = "howdy" }; And get: val it = ("hi","howdy") : string * string