???? ????? 214?? ???? ????? ???， ??? ???? ? ? ? ??? ???? ???. ?????， ???? ??? ???? A-Z, AA-ZZ, ? ?? Z -> A (??)? ??? ?????.

A-Z: ? ?? A-J, ? ?? K-T, ? ?? U-Y, ? ?? Z.

AA-BB: A-B, C-D, E-F, G-H, I-J, K-L, M-N, O-P, Q-R, S-T, U-V, W-X, Y-Z.

A-Zaa: ? ??? A-Ya, Zzzz (???? ?? ?? ??? ??? ??).

A-Zaabb: Aa, Bb, Cc, Dd, Ee, Ff, Gg, Hh, Ii, Jj, Kk, Ll, Mm, Nn, Oo, Pp, Qq, Rr, Ss, Tt, Uu, Vv, Ww, Xx, Yy.

A-Zaaabbb: Aaa, BBbb, Ccc, Ddd, Eee, Ffff (A-Zaabb + z).

A-Zaaabbbcc: Aaabbcc (A-Zaaabbb + c).

A-Zaaabbbccc: Aaabbccc (A-Zaaabbb + c).

A-Zaaabbbddd: Aaabbddd (A-Zaaabbb + d).

A-Zaaabbbeeee: Aaabbeeee (A-Zaaabbb + e).

A-Zaaabbbffffff: Aaaaaaaaaaa (A-Zaaabbb + f).

A-Zaaabbbgggggg: Aaabbgggggg (A-Zaaabbb + g).

A-Zaaabbbhhhhh: Aaabbhhhhh (A-Zaaabbb + h).

A-Zaaabbbkkkk: Aaaabkkkkk (A-Zaaabbb + k).

A-Zaaabbbllll: Aaaabllll (A-Zaaabbb + l).

A-Zaaabbbmmmm: Aaaabmmmmm (A-Zaaabbb + m).

A-Zaaabbbnnnn: Aaaabnnnnn (A-Zaaabbb + n).

A-Zaaabbbpppp: Aaaapppppp (A-Zaaabbb + p).

A-Zaaabbbqqqq: Aaaaqqqqq (A-Zaaabbb + q).

A-Zaaabbbrrrr: Aaaabrrrrr (A-Zaaabbb + r).

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