An internal-combustion engine is disclosed in which a pair of inlet valves and a pair of outlet valves are provided within the combustion chamber formed in each of a row of cylinders. Moreover, the system allows combining of one or more partial flows of pre-existing flow blocks, and special processing into another processing flow block. The positioning and buckling structure includes a snapping piece extending from the folded side portion. The inner housing also includes an electronics compartment closure that together with the chassis define an electronics compartment that contains electronics of the scale, including display electronics and user-controls electronics. The trench is aligned with the via. Alternatively, the reference direction is determined as a direction with the minimum dispersion value among the plurality of candidate directions.