diff --git a/src/model/question_set.ts b/src/model/question_set.ts
index f9464dd..f977e1c 100644
--- a/src/model/question_set.ts
+++ b/src/model/question_set.ts
@@ -1,19 +1,13 @@
 import { MultipleChoiceBuilder, MultipleChoice } from './mc'
 import { v4 as uuidv4 } from 'uuid'
 export class QuestionSet {
-  readonly name: string
+  name: string
 
-  readonly questions: ReadonlyArray<Question>
+  questions: Question[]
 
   readonly id: string
 
-  static create({
-    name,
-    questions,
-  }: {
-    name: string
-    questions: ReadonlyArray<Question>
-  }) {
+  static create({ name, questions }: { name: string; questions: Question[] }) {
     const id = uuidv4()
     return new QuestionSet({ id, name, questions })
   }
@@ -25,7 +19,7 @@ export class QuestionSet {
   }: {
     id: string
     name: string
-    questions: ReadonlyArray<Question>
+    questions: Question[]
   }) {
     this.id = id
     this.name = name