iii iim iip iir iis im- imi imm imp ims ipi ipm ipp ipr ips ir- iri irm irp irr irs is- isi ism isp isr iss m-r mi- mii mim mip mir mis mmi mmm mmp mmr mms mpi mpm mpp mpr mps mri mrm mrp mrr mrs msi msm msp msr mss p-p pii pim pip pir pis pmi pmm pmp pmr pms ppi ppm ppp ppr pps pri prm prp prr prs ps- psi psm psp psr pss rii rim rip rir ris rmi rmm rmp rmr rms rpi rpm rpp rpr rps rri rrm rrp rrr rrs rsi rsm rsp rsr rss sii sim sip sir sis smi smm smp smr sms spi spm spp spr sps sr- sri srm srp srr srs ss- ssi ssm ssp ssr sss