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1.)

fun squareSum nil = 0
    | squareSum(h::t) = h*h + squareSum(t);

    how do tail recursive halp

2.)

fun secondSmall (null, s) = nil
    | secondSmall (h::t, s) =
            if (s > List.nth(t, 0) or s = nil)
                s = h
                secondSmall(t, List.nth(t, 0))
            else
                secondSmall(t, s)