fff ffi ffn ffr ffs ffu fif fii fin fir fis fiu fnf fni fnn fnr fns fnu frf fri frn frr frs fru fsf fsi fsn fsr fss fsu fuf fui fun fur fus fuu i-f iff ifi ifn ifr ifs ifu iif iii iin iir iis iiu in- inf ini inn inr ins inu ir- irf iri irn irr irs iru is- isf isi isn isr iss isu iu- iui iur ius n-i nff nfi nfn nfr nfs nfu nif nii nin nir nis niu nnf nni nnn nns nnu nrf nri nrn nrr nrs nru nsf nsi nsn nsr nss nsu nui nun nur nus nuu rff rfi rfn rfr rfs rfu rif rii rin rir ris rni rnn rnr rns rnu rrf rri rrn rrr rrs rru rsf rsi rsn rsr rss rsu ruf rui run rur rus ruu sff sfi sfn sfr sfs sfu sif sii sin sir sis siu snf sni snn snr sns snu sr- srf sri srn srr srs ss- ssf ssi ssn ssr sss ssu suf sui sun sur sus suu uff ufi ufn ufr ufs ufu uif uii uin uir uis uiu un- unf uni unn unr uns unu ur- urf uri urn urr urs uru usf usi usn usr uss usu uun uur uus uuu