func multiplier(n1, n2) {
    func (n3) {
        n1 * n2 * n3
    }
}

var x  = 2.0
var xi = 0.5
var y  = 4.0
var yi = 0.25
var z  = (x + y)
var zi = (1 / (x + y))

var numbers = [x, y, z]
var inverses = [xi, yi, zi]

for f,g (numbers ~Z inverses) {
    say multiplier(f, g)(0.5)
}