A system and method of frame synchronization and detection for use in a digital receiver within a communication system. A first gas and a second gas are provided into the deposition chamber. A candidate handwritten object is identified by detecting a corresponding logical structure. The pump re-circulates extraction fluid from the downstream end back to the upstream end so as to progressively erode the test product and distribute the test product in the extraction fluid. The first and second connector are shifted from the connector temporary-fitting position to the connector fitting position as the lever is shift from a movement start position to a fitting completion position.