• Source 
    1. #s1="SELECT LOWER('HELLO, WORLD');"
    2. #s2='$><<%!\x68\x65\x6c\x6c\x6F\x2c\x20\x77\x6F\x72\x6c\x64!'
    3. #(0x20..0x7e).each{|n|str=n.chr; $><<str if (!s1.include?(str)&&!s2.include?(str))}
    4.  
    5. v='"#&*+-./139:=?@ABGIJKMNPQUVXYZ[]^_`abdefghijklmnopqrstuvwyz{|}~'
    6. v.each_byte{|b|
    7. 	v.each_byte{|c|
    8. #		print b.chr+"+"+c.chr+"\n" if (b&c) == 0x20
    9. 		print b.chr+"+"+c.chr+"\n" if (b&c) == 0x2c
    10. 	}
    11. }