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c=(c-'A')%26+'a' c=c+32 c=c-'A'+'a' c=('A'+c)%26-'a'
c=(c-'A')%26+'a' c=c+32 c=c-'A'+'a' c=('A'+%26-'a'
c=(c-'A')%26+'a' c=c+32 c=c-'A'+'a' a=('A'+%26-'a'
c=(c-'A')%26+'A' c=c+32 c=c-'A'+'A' c=('A'+
C=(C一'A')%26+'a' C=C+32 C=C-'A'+'a' C=('A'+C)%26-'a'
c=(c-'A')%26+'a' c=c+32 c=c-'A'+'a' c=('A'+c)%26-'a'
c=(’A’+c)%26-’a’ c=c+32 c=c-’A’+’a’ c=(c-’A’)%26+’a’
c=(c-'A')%26+'a' c=c+32 c=c-'A'+'a' c=('A'+c)%26-'a'