penisland --------- w_substrs: [[3,5],[],[],[2,6],[],[4],[2,3],[],[]] n_substrs: [[],[2],[1],[],[1,2],[1],[],[2],[1]] pen island penis land pen is land penis [l] and pen is [l] and penis [l] an [d] pen is [l] an [d] zatxtaz ------- w_substrs: [[],[2],[],[],[2],[],[]] n_substrs: [[1],[],[2],[1],[],[2],[1]] [z] at [x] ta [z] xapenx ------ w_substrs: [[],[3],[3],[],[],[]] n_substrs: [[1,2],[1],[],[3],[2],[1]] [x] ape [nx] [xa] pen [x]