entities.put("or", "\u2228");
        entities.put("cap", "\u2229");
        entities.put("cup", "\u222a");
        entities.put("int", "\u222b");
        entities.put("there4", "\u2234");
        entities.put("sim", "\u223c");
        entities.put("cong", "\u2245");
        entities.put("asymp", "\u2248");
        entities.put("ne", "\u2260");
        entities.put("equiv", "\u2261");
        entities.put("le", "\u2264");