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Super combinator

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A super combinator is either a constant, or a Combinator which contains only super combinators as subexpressions.

This definition is bewildering until you realize that a Combinator can have non-Combinator internal subexpressions. A super combinator is "internally pure" (every internal lambda is a combinator) as well as externally.

Any Haskell program can be converted into super combinators using Lambda lifting.

See also Constant applicative form