When creating or editing a document in a content management system and specific content is needed, documents in the repository are searched for an element that has the desired content. The first device region has a substantially planar surface oriented along one of a first set of equivalent crystal planes, and the second device region contains a protruding semiconductor structure having multiple intercepting surfaces oriented along a second, different set of equivalent crystal planes. At least one or more downstream taps can be located to face perpendicular to the direction of flow, such that the fluid after passing over a flow sensor passes through the downstream tap. The second lengthwise wall has a third mating section protruded from an outer face thereof.