aaaa aaab aaad aaal aaav aaba aabb aabd aabl aada aala aald aall aava abaa abab abad abal abb- abba abbb abda abla ablv abva abvd adaa adab adad adal adba adda addd addl advb alaa alad alal alb- alba ald- alda aldl all- alla alll alva avab aval avda avlb avva baaa baad baal baba babb bada badb badd bala bald ball bava bbad bbbb bbdd bblb bdav blaa blab blad blvd daab daad daal daba dabb dada dala dall dava dddd dlab dlbd dvda dvla dvvl laaa laad laal laba lada ladd lala lald lall lava lddv lldb llll lvad vaad vaal vada vala vald vall vava vlab vlad vlba vldb vldl vvvv