code: function compareTaggedSentences(sentenceInOldFormat, sentenceInNewFormat) {
    var equal = true;
    sentenceInOldFormat.forEach(function(wordPlusTag, index) {
      equal = equal &&
        (wordPlusTag[1] === sentenceInNewFormat.taggedWords[index].tag);
      DEBUG && console.log(wordPlusTag[1] + ' ' + sentenceInNewFormat.taggedWords[index].tag);
    });
    return equal;
  }
docs: Compares two tagged sentences. First one is in the old POSJS format, i.e. an array of two position arrays. The second one is a Sentence object that holds an array of objects for each position {token: "string", tag: "string"}