bomom[9], borom[8], robom[8], morom[7],
boom[7], obom[7], brom[7], romb[7], omom[6], boro[6], robo[6], moro[5], orom[5],
bom[6], mob[6], bor[5], rob[5], omo[4], mor[4], oro[3],
bo[4], om[3], or[2], ro[2],
