a-a a-i aaa aai aan aap aas ai- aia aii ain aip ais an- ana ani ann anp ans ap- apa api apn app aps as- asa asi asn asp ass ia- iaa iai ian iap ias iia iii iin iip iis in- ina ini inn inp ins ipa ipi ipn ipp ips is- isa isi isn isp iss n-i naa nai nan nap nas nia nii nin nip nis nna nni nnn nnp nns npa npi npn npp nps nsa nsi nsn nsp nss p-p paa pai pan pap pas pia pii pin pip pis pn- pna pni pnn pnp pns ppa ppi ppn ppp pps ps- psa psi psn psp pss saa sai san sap sas sia sii sin sip sis sna sni snn snp sns spa spi spn spp sps ss- ssa ssi ssn ssp sss