Function flatten

packages/diff-sequences/src/__tests__/index.property.test.ts:39–45

(data: Array<Array<string>>)

};

const flatten = (data: Array<Array<string>>) => {
  const array: Array<string> = [];
  for (const items of data) {
    array.push(...items);
  }
  return array;
};

const isSubsequenceOf = (
  subsequence: Array<string>,