{{:c1.jpg?100|}} - Click here to add a corner between the two corners on which the helpers lie. The new corner is created at the position of the architect.
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{{:c2.jpg?100|}} - Click here to shift a corner on which the first helper lies, to the position of the architect
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{{:c3.jpg?100|}} - Click here to delete a particular corner. The corner that is deleted is the one that has the first helper on it