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/*
identity I a → a
constant K a → b → a
apply A (a → b) → a → b
thrush T a → (a → b) → b
duplication W (a → a → b) → a → b
flip C (a → b → c) → b → a → c
compose B (b → c) → (a → b) → a → c
substitution S (a → b → c) → (a → b) → a → c
chain S_³ (a → b → c) → (b → a) → b → c
converge S2³ (b → c → d) → (a → b) → (a → c) → a → d
psi P (b → b → c) → (a → b) → a → a → c
fix-point4 Y (a → a) → a
*/
const I = x => x
const K = x => y => x
const A = f => x => f (x)
const T = x => f => f (x)
const W = f => x => f (x) (x)
const C = f => y => x => f (x) (y)
const B = f => g => x => f (g (x))
const S = f => g => x => f (x) (g (x))
const S_ = f => g => x => f (g (x)) (x)
const S2 = f => g => h => x => f (g (x)) (h (x))
const P = f => g => x => y => f (g (x)) (g (y))
const Y = f => (g => g (g)) (g => f (x => g (g) (x)))
// see also
// https://ramdajs.com/
// https://sanctuary.js.org/
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