iii iim iin iip iis im- imi imm imn imp ims in- ini inm inn inp ins ipi ipm ipn ipp ips is- isi ism isn isp iss mi- mii mim min mip mis mmi mmm mmn mmp mms mni mnm mnn mnp mns mpi mpm mpn mpp mps msi msm msn msp mss n-i nii nim nin nip nis nmi nmm nmn nmp nms nni nnm nnn nnp nns npi npm npn npp nps nsi nsm nsn nsp nss p-p pii pim pin pip pis pmi pmm pmn pmp pms pn- pni pnm pnn pnp pns ppi ppm ppn ppp pps ps- psi psm psn psp pss sii sim sin sip sis smi smm smn smp sms sni snm snn snp sns spi spm spn spp sps ss- ssi ssm ssn ssp sss