code: function step1c$1(token) {
                  var r1 = getR1(token);
  
                  if (!r1) {
                      return token;
                  }
  
                  if (r1.match(/(erte|ert)$/)) {
                      return token.replace(/(erte|ert)$/, 'er');
                  }
  
                  return token;
              }
docs: step 1c as defined for the porter stemmer algorithm.