iii iim iin iio iip iis im- imi imm imn imo imp ims in- ini inm inn ino inp ins io- ioi iom ion ioo iop ios ipi ipm ipn ipo ipp ips is- isi ism isn iso isp iss m-o mi- mii mim min mio mip mis mmi mmm mmn mmo mmp mms mni mnm mnn mno mnp mns moi mom mon moo mop mos mpi mpm mpn mpo mpp mps msi msm msn mso msp mss n-i nii nim nin nio nip nis nmi nmm nmn nmo nmp nms nni nnm nnn nno nnp nns no- noi nom non noo nop nos npi npm npn npo npp nps nsi nsm nsn nso nsp nss o-i oii oim oin oio oip ois om- omi omm omn omo omp oms on- oni onn ono onp ons oo- ooi oom oon ooo oop oos op- opi opm opn opo opp ops os- osi osm osn oso osp oss p-p pii pim pin pio pip pis pmi pmm pmn pmo pmp pms pn- pni pnm pnn pno pnp pns poi pom pon poo pop pos ppi ppm ppn ppo ppp pps ps- psi psm psn pso psp pss sii sim sin sio sip sis smi smm smn smo smp sms sni snm snn sno snp sns soi som son soo sop sos spi spm spn spo spp sps ss- ssi ssm ssn sso ssp sss