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kk>='A'&&kk<='Z' !(kk>='A' kk<='Z') (kk+32)>='a'&&(kk+32)<='z' isalpha(kk)&&(kk<91)
kk>='A'&&kk<='Z' !(kk>='A'‖kk<='Z') (kk+32)>='a'&&(kk+32)<='z' isalpha(kk)&&(kk<91)
kk>='A'&&kk<='Z' !(kk>='A'‖kk<='Z') (kk+32)>='a'&&(kk+32)<='z' isalpha(kk)&&(kk<91)
kk>='A'&&kk<='Z' !(kk>='A' kk<='Z') (kk+32)>='a'&&(kk+32)<='z' isalpha(k&&(kk<91)
kk>='A'&&kk<='Z' !(kk>='A'‖kk<='Z') (kk+32)>='a'&&(kk+32)<='z' isalpha(kk)&&(kk<91)
kk>='A'&&kk<='Z' !(kk>='A' kk<="Z") (kk+32)>='a'&&(kk+32)<='Z' isalpha(kk)&&(kk<91)
kk>='A'&&kk<='Z' !(kk>='A' kk<='Z') (kk+32)>='a'&&(kk+32)<='z' isalpha(kk)&&(kk<91)
kk>='A'&&kk<='Z' !(kk>='A' kk<='Z') (kk+32)>='a'&&(kk+32)<='z' isalpha(kk)&&(kk<91)
m=1,n=1 m=l,n=l m=1,n=1 m=1,n=2 m=1,n=1 m=1,n=1 m=2,n=1 m=2,n=2
kk>='A'&&kk<='Z' !(kk)='A' kk<='Z') (kk+32)>='a'&&(kk+32)<='z' isalpha(kk)&&(kk<91)
kk>='A'&&kk<='Z' !(kk>='A' kk<='Z') (kk+32)>='a'&&(kk+32)<='z' isalpha(kk)&&(kk<91)
kk>='A'&&kk<='Z' !(kk>='A'‖kk<='Z') (kk+32)>='a'&&(kk+32)<='z' isalpha(k&&(kk<91)
m=1,n=1 m=l,n=l
m=1,n=1 m=1,n=2 m=1,n=1 m=1,n=1
m=2,n=1 m=2,n=2
m=1,n=1 m=1,n=1 m=1,n=1 m=1,n=2 m=1,n=1 m=2,n=1 m=1,n=1 m=2,n=2
kk>='A'&&kk<='Z' !(kk>='A' kk<="Z") (kk+32)>='a'&&(kk+32)<='Z' isalpha(k&&(kk<91)
kk>='A'&&kk<='Z' !(kk>='A' kk<='Z') (kk+32)>='a'&&(kk+32)<='z' isalpha(kk)&&(kk<91)