m-o mmm mmn mmo mmp mms mnm mnn mno mnp mns mom mon moo mop mos mpm mpn mpo mpp mps msm msn mso msp mss nmm nmn nmo nmp nms nnm nnn nno nnp nns no- nom non noo nop nos npm npn npo npp nps nsm nsn nso nsp nss om- omm omn omo omp oms on- onn ono onp ons oo- oom oon ooo oop oos op- opm opn opo opp ops os- osm osn oso osp oss p-p pmm pmn pmo pmp pms pn- pnm pnn pno pnp pns pom pon poo pop pos ppm ppn ppo ppp pps ps- psm psn pso psp pss smm smn smo smp sms snm snn sno snp sns som son soo sop sos spm spn spo spp sps ss- ssm ssn sso ssp sss