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let exchange (a : int, b : int) : Move =
fun circle ->
let valA = circle.[a] in
circle.[a] <- circle.[b];
circle.[b] <- valA;
let partner (a : char, b : char) : Move =
fun circle ->
let idxA = Array.findIndex ((=) a) circle in
let idxB = Array.findIndex ((=) b) circle in
exchange (idxA, idxB) circle
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