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s="abcdefghijklmnopqrstuvwxyz"print(s..s:upper().."_0123456789")
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##Lua, 64 Bytes
##Lua, 5464 Bytes
s="abcdefghijklmnopqrstuvwxyz"print(s..s:upper().."_""_0123456789")
##Lua, 54 Bytes
s="abcdefghijklmnopqrstuvwxyz"print(s..s:upper().."_")
