a = "'"; b = '"'; c = "trace"; d = ' trace("; a = "+b+a+b+"; b = "+a+b+a+"; c ="+b+c+b +"; d = "+a+d+a+ d)'; trace("a = "+b+a+b+"; b = "+a+b+a+"; c ="+b+c+b +"; d = "+a+d+a+ d)
