abba[8], baba[8], bebe[8], baca[7], caba[7], bada[7], bace[7], bece[7], caca[6], dada[6], dece[6],
bab[7], cab[6], bad[6], dba[6], bee[5],
ba[4], be[4], ad[3], da[3], ce[3], de[3], aa[2], ee[2],
