floyd = cluster is triangle
    rep = null

    width = proc (n: int) returns (int)
        w: int := 1
        while n >= 10 do
            w := w + 1
            n := n / 10
        end
        return (w)
    end width

    triangle = proc (rows: int) returns (string)
        ss: stream := stream$create_output()
        maxno: int := rows * (rows+1)/2
        num: int := 1
        for row: int in int$from_to(1, rows) do
            for col: int in int$from_to(1, row) do
                stream$putright(ss, int$unparse(num), 1 + width(maxno-rows+col))
                num := num + 1
            end
            stream$putl(ss, "")
        end
        return (stream$get_contents(ss))
    end triangle
end floyd

start_up = proc ()
    po: stream := stream$primary_output()
    stream$putl(po, floyd$triangle(5))
    stream$putl(po, floyd$triangle(14))
end start_up