unction prepend(e, Ist) { return Ist = node(e, Ist); } onst sum = Ist => Ist.isEmpty() ? 0 : Ist.head() + sum(Ist.tail()); et Ist1 = node(A, node(B, empty()); repend(A, Ist1); et Ist2 = prepend(B, Ist1); onsole.log(sum(Ist1)); onsole.log(sum(Ist2)); the two numbers printed are 17 and 26, what is the value of B?

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