ddd ddi ddo ddp dds di- did dii dio dip dis div dod doi doo dop dos dov dpd dpi dpo dpp dps dpv dsd dsi dso dsp dss dsv dvd dvi dvp dvs i-d i-v idd idi ido idp ids idv iid iii iio iip iis io- iod ioi ioo iop ios iov ipd ipi ipo ipp ips ipv is- isd isi iso isp iss isv ivd ivi ivo ivp ivs ivv o-i odd odi odo odp ods odv oid oii oio oip ois oiv oo- ood ooi ooo oop oos oov op- opd opi opo opp ops opv os- osd osi oso osp oss osv ov- ovd ovi ovo ovp ovs ovv p-p pdd pdi pdo pdp pds pdv pid pii pio pip pis piv pod poi poo pop pos pov ppd ppi ppo ppp pps ppv ps- psd psi pso psp pss psv pvd pvi pvo pvp pvs pvv sdd sdi sdo sdp sds sdv sid sii sio sip sis siv sod soi soo sop sos sov spd spi spo spp sps spv ss- ssd ssi sso ssp sss ssv svd svi svo svp svs svv vdd vdi vdo vdp vds vdv vi- vid vii vio vip vis viv vod voi voo vop vos vov vpd vpi vpo vpp vps vsd vsi vso vsp vss vsv vvi vvo vvs vvv