ddd ddi ddk ddo ddp dds di- did dii dik dio dip dis dki dkk dko dkp dks dod doi dok doo dop dos dpd dpi dpk dpo dpp dps dsd dsi dsk dso dsp dss i-d idd idi idk ido idp ids iid iii iio iip iis iki ikk iko iks io- iod ioi ioo iop ios ipd ipi ipo ipp ips is- isd isi isk iso isp iss kdk kdo kdp kds kid kii kik kio kip kis kki kkk kkp kks kod koi kok koo kop kos kpd kpi kpk kpo kpp kps ksd ksi ksk kso ksp kss o-i odd odi odo odp ods oid oii oik oio oip ois okd oki okk oko okp oks oo- ood ooi ook ooo oop oos op- opd opi opk opo opp ops os- osd osi osk oso osp oss p-p pdd pdi pdk pdo pdp pds pid pii pik pio pip pis pkd pki pko pkp pks pod poi pok poo pop pos ppd ppi ppk ppo ppp pps ps- psd psi psk pso psp pss sdd sdi sdk sdo sdp sds sid sii sik sio sip sis sk- skd ski skk sko skp sks sod soi sok soo sop sos spd spi spk spo spp sps ss- ssd ssi ssk sso ssp sss