fff ffl ffn ffs ffu flf fll fln fls flu fnf fnl fnn fns fnu fsf fsl fsn fss fsu fuf ful fun fus fuu lff lfl lfn lfs lfu llf lll lln lls llu lnl lnn lns lnu lsf lsl lsn lss lsu luf lul lun lus luu nff nfl nfn nfs nfu nlf nll nln nls nlu nnf nnl nnn nns nnu nsf nsl nsn nss nsu nul nun nus nuu sff sfl sfn sfs sfu slf sll sln sls slu snf snl snn sns snu ss- ssf ssl ssn sss ssu suf sul sun sus suu uff ufl ufn ufs ufu ulf ull uln uls ulu un- unf unl unn uns unu usf usl usn uss usu uun uus uuu