double nF = computeToFactor(dC,n); double dF = computeToFactor(dtC, d); factor = nF/dF;
String nF = computeToFactor(dC,n); String dF = computeToFactor(dtC, d); factor = "("+nF+"/"+dF+")";
        UnitTuple(String n, String d) {          num = n;          den = d;          sden = unpluralize(den);          double nF = computeToFactor(dC,n);          double dF = computeToFactor(dtC, d);          factor = nF/dF;        }