def permut(x):
    a = list()
    for i in range(len(x)):
        for j in range(i, len(x)):
            if (i != j):
                a.append(((str(x[i]) + '-') + str(x[j])))
    return a
def permut(x):
    a = list()
    for i in range(len(x)):
        for j in range(i, len(x)):
            if (i != j):
                a.append(((str(x[i]) + '-') + str(x[j])))
    return a