ddd ddi ddo dds ddx di- did dii dio dis dix dod doi doo dos dox dsd dsi dso dss dsx dxd dxi dxo dxs dxx i-d idd idi ido ids idx iid iii iio iis iix io- iod ioi ioo ios is- isd isi iso iss ixi o-i odd odi odo ods oid oii oio ois oo- ood ooi ooo oos oox os- osd osi oso oss osx ox- oxi oxo oxx sdd sdi sdo sds sid sii sio sis six sod soi soo sos sox ss- ssd ssi sso sss ssx sxi sxs xdi xds xii xio xis xix xod xoi xoo xos xox xsi xss xxi xxo xxx