Openlayers 3 cant delete feature

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I am using OpenLayers 3. Here i found how to create and read drawn features. Now i am trying to delete a feature after i draw it on the map. I have tried several methods , but it doesn't want to delete the selected feature.

Draw features example
</br> Geometry type None Point LineString Polygon Circle Square Box </br> Image type Stop Sign Argentina



.map { width: 100%; height: 400px; }

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