"x" << "x" ----> none
"x" << "X" ----> none
"X" << "x" ----> "x"
"xx" <<= "xx" ----> "xx"
"xxx" <<= "xx" ----> none
"xx" <<= "xxx" ----> "xxx"
"x" >>= "x" ----> "x"
"x" >>= "xx" ----> none
"xx" >>= "x" ----> "x"
"x" >> "x" ----> none
"x" >> "X" ----> "X"
"X" >> "x" ----> none
"x" == "x" ----> "x"
"x" == "X" ----> none
"X" == "x" ----> none
"x" ~== "x" ----> none
"x" ~== "X" ----> "X"
"X" ~== "x" ----> "x"
Run-time error 103 at line 27 in std08.icn
string expected
offending value: []