DiesIrae

// Usually, you'll want to transpose the input (`CARTESIAN_PRODUCT(TRANSPOSE(X1:Y2))`)
function CARTESIAN_PRODUCT(args) {  
  if (args.length === 0) {
    return [];
  }

  var first = args[0].filter(function (x) { return x !== ""; });
  
  if (args.length === 1) {
    return first;