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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | (* a tautology checker *)
datatype t =
Base of bool
| Fun of bool -> t
val rec taut =
fn Base b => b
| Fun f => taut (f true) andalso taut (f false)
val rec bigTrue =
fn 0 => Base true
| n => Fun (fn _ => bigTrue (n - 1))
val _ = taut (bigTrue 12)
|