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alert("abdefghijklmnopqrstvwxyz""BCDFGHIJKMNPQUVXYZ".toUpperCasetoLowerCase())// !#$%&'*+,-/0123456789:;<=>?@[\]^_`{|}~UC~AERTOWS
prints "ABDEFGHIJKLMNOPQRSTVWXYZ""bcdfghijkmnpquvxyz"
alert("abdefghijklmnopqrstvwxyz".toUpperCase())// !#$%&'*+,-/0123456789:;<=>?@[\]^_`{|}~UC
prints "ABDEFGHIJKLMNOPQRSTVWXYZ"
alert("BCDFGHIJKMNPQUVXYZ".toLowerCase())// !#$%&'*+,-0123456789:;<=>?@[\]^_`{|}~AERTOWS
prints "bcdfghijkmnpquvxyz"
