a-a a-i aaa aaf aai aao aap aar aas af- afa aff afi afo afp afr afs ai- aia aif aii aio aip air ais aoa aof aoi aoo aop aor aos ap- apa apf api apo app apr aps ar- ara arf ari aro arp arr ars as- asa asf asi aso asp asr ass faa faf fai fao fap far fas ffa fff ffi ffo ffp ffr ffs fia fif fii fip fir fis foa fof foi foo fop for fos fpa fpi fpo fpp fpr fps fra frf fri fro frp frr frs fsa fsf fsi fso fsp fsr fss i-f ia- iaa iaf iai iao iap iar ias ifa iff ifi ifo ifp ifr ifs iia iif iii iio iip iir iis io- ioa iof ioi ioo iop ior ios ipa ipf ipi ipo ipp ipr ips ir- ira irf iri iro irp irr irs is- isa isf isi iso isp isr iss o-i oaa oaf oai oao oap oar oas of- ofa off ofi ofo ofp ofr ofs oia oif oii oio oip oir ois oo- ooa oof ooi ooo oop oor oos op- opa opf opi opo opp opr ops or- ora orf ori oro orp orr ors os- osa osf osi oso osp osr oss p-p paa paf pai pao pap par pas pfa pff pfi pfo pfp pfr pfs pia pif pii pio pip pir pis poa pof poi poo pop por pos ppa ppf ppi ppo ppp ppr pps pra prf pri pro prp prr prs ps- psa psf psi pso psp psr pss ra- raa raf rai rao rap rar ras rfa rff rfi rfo rfp rfr rfs ria rif rii rio rip rir ris roa rof roi roo rop ror ros rpa rpf rpi rpo rpp rpr rps rra rrf rri rrp rrr rrs rsa rsf rsi rso rsp rsr rss saa saf sai sao sap sar sas sfa sff sfi sfo sfp sfr sfs sia sif sii sio sip sir sis soa sof soi soo sop sor sos spa spf spi spo spp spr sps sr- sra srf sri sro srp srr srs ss- ssa ssf ssi sso ssp ssr sss