print "\u\LdD\n";   # Dd   It seems, first works \L, then \u. Good.
print "\u\la\n";    # A  First \l, then \u. Good!
print "\l\ua\n";    # a  First \u, then \l. Good!!
print "\L\udD\n";   # Dd   It seems, first works \L, then \u, hm...
print "\LdD\udD\n"; # dddd  It seems, first works \u, then \L, hmmm...

print "\L\Ua\n";    # Syntax error
print "\U\La\n";    # Syntax error
print "\L\La\n";    # Syntax error
print "\u\la\n";    # A  All right
print "\u\ua\n";    # A  All right