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// retoor <retoor@molodetz.nl>
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System.print("hello".isLower) // expect: true
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System.print("Hello".isLower) // expect: false
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System.print("HELLO".isLower) // expect: false
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System.print("123".isLower) // expect: false
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System.print("".isLower) // expect: false
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System.print("HELLO".isUpper) // expect: true
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System.print("Hello".isUpper) // expect: false
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System.print("hello".isUpper) // expect: false
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System.print("123".isUpper) // expect: false
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System.print("".isUpper) // expect: false
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System.print("12345".isDigit) // expect: true
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System.print("123a5".isDigit) // expect: false
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System.print("".isDigit) // expect: false
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System.print("0".isDigit) // expect: true
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System.print("hello".isAlpha) // expect: true
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System.print("Hello".isAlpha) // expect: true
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System.print("hello1".isAlpha) // expect: false
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System.print("".isAlpha) // expect: false
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System.print("hello123".isAlphaNumeric) // expect: true
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System.print("Hello".isAlphaNumeric) // expect: true
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System.print("12345".isAlphaNumeric) // expect: true
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System.print("hello!".isAlphaNumeric) // expect: false
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System.print("".isAlphaNumeric) // expect: false
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System.print(" ".isSpace) // expect: true
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System.print(" \t\n".isSpace) // expect: true
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System.print("hello".isSpace) // expect: false
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System.print("".isSpace) // expect: false
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System.print("hello".isAscii) // expect: true
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System.print("123!@#".isAscii) // expect: true
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System.print("".isAscii) // expect: true
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