iii iim iio iip iis im- imi imm imo imp ims io- ioi iom ioo iop ios ipi ipm ipo ipp ips is- isi ism iso isp iss m-o mi- mii mim mio mip mis mmi mmm mmo mmp mms moi mom moo mop mos mpi mpm mpo mpp mps msi msm mso msp mss o-i oii oim oio oip ois om- omi omm omo omp oms oo- ooi oom ooo oop oos op- opi opm opo opp ops os- osi osm oso osp oss p-p pii pim pio pip pis pmi pmm pmo pmp pms poi pom poo pop pos ppi ppm ppo ppp pps ps- psi psm pso psp pss sii sim sio sip sis smi smm smo smp sms soi som soo sop sos spi spm spo spp sps ss- ssi ssm sso ssp sss