a-a a-i aaa aai aap aar aas ai- aia aii aip air ais ap- apa api app apr aps ar- ara ari arp arr ars as- asa asi asp asr ass ia- iaa iai iap iar ias iia iii iip iir iis ipa ipi ipp ipr ips ir- ira iri irp irr irs is- isa isi isp isr iss p-p paa pai pap par pas pia pii pip pir pis ppa ppi ppp ppr pps pra pri prp prr prs ps- psa psi psp psr pss ra- raa rai rap rar ras ria rii rip rir ris rpa rpi rpp rpr rps rra rri rrp rrr rrs rsa rsi rsp rsr rss saa sai sap sar sas sia sii sip sir sis spa spi spp spr sps sr- sra sri srp srr srs ss- ssa ssi ssp ssr sss