arbo[6], baor[6], bora[6], roba[6], boro[6], robo[6],
abo[5], boa[5], oba[5], arb[5], bar[5], rab[5], bor[5], rob[5], aro[3], ora[3], oro[3],
ba[4], bo[4], ar[2], or[2], ro[2],
