adding a hyphen to the prefix when it is inserted

call.js

@@ -21,7 +21,7 @@ fetch("terms.json")
       nn.querySelector(".actor").innerHTML = choice(terms['actor']);
       nn.querySelector(".action").innerHTML = choice(terms['action']);
       if (randint(0, 2) == 0) {
-        nn.querySelector(".prefix").innerHTML = choice(terms['prefix']);
+        nn.querySelector(".prefix").innerHTML = choice(terms['prefix']) + '-';
       } else {
         nn.querySelector(".prefix").remove();
       }