"%f" -% ""           == "!"
"%f" -% "a"          == "!"
"%f" -% "aa"         == "!"
"%f" -% " "          == "!"
"%f" -% "aaa"        == "!"
"%f" -% "a "         == "!"
"%f" -% " a"         == "!"
"%f" -% "b"          == "!"
"%f" -% "aaaa"       == "!"
"%f" -% "aa "        == "!"
"%f" -% "a a"        == "!"
"%f" -% "ab"         == "!"
"%f" -% 0            == "0.0"
"%f" -% 1            == "1.0"
"%f" -% (-1)         == "-1.0"
"%f" -% 2            == "2.0"
"%f" -% (-2)         == "-2.0"
"%f" -% 3            == "3.0"
"%f" -% (-3)         == "-3.0"
"%f" -% 4            == "4.0"
"%f" -% (-4)         == "-4.0"
"%f" -% 5            == "5.0"
"%f" -% (-5)         == "-5.0"
"%f" -% 6            == "6.0"
"%f" -% 0.0          == "0.0"
"%f" -% 1.0          == "1.0"
"%f" -% (-1.0)       == "-1.0"
"%f" -% Infinity     == "Infinity"
"%f" -% 0.5          == "0.5"
"%f" -% 2.0          == "2.0"
"%f" -% (-Infinity)  == "-Infinity"
"%f" -% (-0.5)       == "-0.5"
"%f" -% (-2.0)       == "-2.0"
"%f" -% 0.33333334   == "0.33333334"
"%f" -% 3.0          == "3.0"
"%f" -% (-0.33333334) == "-0.33333334"
"%f" -% (0 % 1)      == "0.0"
"%f" -% (1 % 1)      == "1.0"
"%f" -% ((-1) % 1)   == "-1.0"
"%f" -% (1 % 2)      == "0.5"
"%f" -% (2 % 1)      == "2.0"
"%f" -% ((-1) % 2)   == "-0.5"
"%f" -% ((-2) % 1)   == "-2.0"
"%f" -% (1 % 3)      == "0"
"%f" -% (3 % 1)      == "3.0"
"%f" -% ((-1) % 3)   == "-0"
"%f" -% ((-3) % 1)   == "-3.0"
"%f" -% (1 % 4)      == "0.25"
"%f" -% 'a'          == "!"
"%f" -% ' '          == "!"
"%f" -% 'b'          == "!"
"%f" -% 'A'          == "!"
"%f" -% 'c'          == "!"
"%f" -% '\n'         == "!"
"%f" -% 'd'          == "!"
"%f" -% '0'          == "!"
"%f" -% 'e'          == "!"
"%f" -% 'B'          == "!"
"%f" -% 'f'          == "!"
"%f" -% '!'          == "!"
"%f" -% False        == "!"
"%f" -% True         == "!"