bbb bbi bbm bbs bi- bib bii bim bis biz bmb bmi bmm bms bmz bsb bsi bsm bss bzs bzz ibb ibi ibm ibs ibz iib iii iim iis im- imb imi imm ims imz is- isb isi ism iss izi izm izz mbb mbi mbm mbs mi- mib mii mim mis miz mmb mmi mmm mms mmz msb msi msm mss mzb mzi mzm sbb sbi sbm sbs sib sii sim sis smb smi smm sms smz ss- ssb ssi ssm sss ssz szi zbb zbm zbs zib zim zis ziz zmb zmm zms zsi zsm zsz zzs zzz