buc[8], pub[8], obu[7], cup[7], puc[7], cab[6], cob[6], opu[6], aby[6], boy[6], oby[6], abo[5], boa[5], oba[5], cap[5], pac[5], opy[5],
bu[6], by[5], ba[4], bo[4], au[4], co[3], pa[3], op[3], po[3],