a-a a-i aaa aai aao aas aax ai- aia aii aio ais aix aoa aoi aoo aos aox as- asa asi aso ass asx ax- axa axi axo axs axx ia- iaa iai iao ias iia iii iio iis iix io- ioa ioi ioo ios is- isa isi iso iss ixi o-i oaa oai oao oas oax oia oii oio ois oo- ooa ooi ooo oos oox os- osa osi oso oss osx ox- oxa oxi oxo oxx saa sai sao sas sax sia sii sio sis six soa soi soo sos sox ss- ssa ssi sso sss ssx sxi sxs xaa xas xia xii xio xis xix xoa xoi xoo xos xox xsa xsi xss xxi xxo xxx