Disclosed is an internal combustion engine comprising a first and a second cylinder line, each of which is provided with a camshaft for the gas intake valves and the gas discharge valves as well as a mechanism for adjusting a valve overlap between the gas intake valves and the gas discharge vales. In various embodiments, the portion of the child support configured for supporting the head of a child positioned therein is configured to remain substantially aligned with the axis of rotation as the child support oscillates. The tandem organic light emitting diode is applicable in a display device. At least one Internet enabled service component executing in the SLEE also can be included. Multiple sprayers may have overlapping spray patterns for redundancy. When the player desires to change the path of a pitched ball, the player inputs a ball path change direction by inputting a second stroke operation sideways after the first stroke operation.