ionic multiselect

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 <ion-item>
      <ion-label>Select class</ion-label>
            <ion-select formControlName="class" (ionChange)="selectClass()" multiple="true" [(ngModel)]="classstudy"  cancelText="Nah" okText="Okay!">
              <ion-select-option value="{{d.Id}}" *ngFor="let d of class">{{d.class}}</ion-select-option>
            </ion-select>
          </ion-item>

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