ddd ddi ddp ddq dds di- did dii dip diq dis dpd dpi dpp dps dqs dsd dsi dsp dsq dss i-d idd idi idp idq ids iid iii iip iis ipd ipi ipp ips iqd iqs is- isd isi isp isq iss p-p pdd pdi pdp pdq pds pid pii pip piq pis ppd ppi ppp ppq pps pqi pqq pqs ps- psd psi psp pss qds qid qip qis qpp qps qqq qsd qsi qsp sdd sdi sdp sdq sds sid sii sip siq sis spd spi spp spq sps sqd sqi sqq sqs ss- ssd ssi ssp ssq sss