ddd ddi ddn ddp dds di- did dii din dip dis dnd dni dnn dnp dns dpd dpi dpn dpp dps dsd dsi dsn dsp dss i-d idd idi idn idp ids iid iii iin iip iis in- ind ini inn inp ins ipd ipi ipn ipp ips is- isd isi isn isp iss n-i ndd ndi ndn ndp nds nid nii nin nip nis nni nnn nnp nns npd npi npn npp nps nsd nsi nsn nsp nss p-p pdd pdi pdn pdp pds pid pii pin pip pis pn- pnd pni pnn pnp pns ppd ppi ppn ppp pps ps- psd psi psn psp pss sdd sdi sdn sdp sds sid sii sin sip sis snd sni snn snp sns spd spi spn spp sps ss- ssd ssi ssn ssp sss