@ubc
u = f () {

    F = ._("F ub: ")
    Sc = ._("Sc ub: ")

    A = __(.($\, F))
    B = __(.($\, Sc))

    .f("Su: ~~", [A + B])
    .f("Dffc: ~~", [A - B])
    .f("Puc: ~~", [A * B])
    .f("Qu: ~~", [A  B])
    .f("R: ~~", [A % B])
}