The contingency removal form is actually designed to cover the removal of both buyer and seller contingencies. The first section of the form focuses on contingencies that allow the buyer to back out. The second section deals with the seller's removal of a seller contingency.
The buyer has to provide one, or more, signed Contingency Removal forms. Each one removing, or more, of the contract contingencies. Once the buyer has removed all of them in writing, they may no longer receive a refund of their deposit.