aaaa aaab aaal aaba aabb aabl aala aall aalo aaoo abaa abab abal abb- abba abbb abbo abla ablo aboa abob abol aboo alaa alal alao alb- alba albo all- alla alll allo aloa alol aloo aoba aola baaa baal baba babb babo bala ball balo baol bbbb bblb blaa blab blob bloo boab boal boba bobb bobo bola boll bolo boob bool laaa laal laba labo lala lall lalo llao llll lloa lloo lob- loba lobb lobo lola loll lolo loob lool oall obal obba obbo obla obol olba olbo olla ollo ooaa ooba oola oolo oooo