fff ffl ffm ffs ffu flf fll flm fls flu fmf fml fmm fms fmu fsf fsl fsm fss fsu fuf ful fum fus fuu lff lfl lfm lfs lfu llf lll llm lls llu lmf lml lmm lms lmu lsf lsl lsm lss lsu luf lul lum lus luu m-f mff mfl mfm mfs mfu mlf mll mlm mls mlu mmf mml mmm mms mmu msf msl msm mss msu muf mul mum mus muu sff sfl sfm sfs sfu slf sll slm sls slu smf sml smm sms smu ss- ssf ssl ssm sss ssu suf sul sum sus suu uff ufl ufm ufs ufu ulf ull ulm uls ulu um- umf uml umm ums umu usf usl usm uss usu uum uus uuu