iterate = function (
parameter,
callback = function (x) {
return (tuple) =>
`${tuple[0]} / ${tuple[1]} * ${Array(tuple[2]).fill(x).join(" * ")}`;
}
) {
return parameter != 0
? [parameter]
.concat(Array.from(series.slice(1), callback(parameter)))
.join(" + ")
: "0";
}