{HEAD ~ FIGS 1 and 2 show} in each case the schematic representation of a device 1 for changing the timing of {TAIL ~ intake and exhaust valves} in an internal combustion engine 
{ HEAD ~ FIGS 1 and 2 show } in each case the schematic representation of a device 1 for changing the timing of { TAIL ~ intake and exhaust valves } in an internal combustion engine
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