The five most difficult words are

Five commonly used hard typing summary Sorting
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Five strokes encoding
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1 tdij 2 I q 3 r 4 years rh 5 have def 6 By rdfh 7 see rhf 8 dance rlg 9 raise udyj 10 you wq 11 beauty ugdu 12 long ta 13 with et 14 text yygy 15 birth tg 16 pen tt 17 paragraph wdm 18 million dnv 19 not gi 20 dry fggh 21 five gg 22 small ih 23 that vfb 24 concave mmgd 25 state ytyh 26 sets ddu 27 good uduk 28 out bm 29 special trf 30 convex hgm 31 into dn 32 through xfm 33 how thfn 34 hair ntc 35 is o 36 body tmd 37 more wtu 38 things Tr 39 heart ny 40 seeking fiy 41 is j 42 west sghg 43 ca gma 44 sheng dnnl 45 a g 46 xin uygh 47 cattle rhk 48 music qi 49 from thd 50 in d