If, during {TAIL ~ the activation process} of gas exchange valve 10, {HEAD ~ the current} to magnetic valve 42 is switched off, magnetic valve 42 opens, and triggers, through the relief of hydraulic working chamber 20, the closing process of gas exchange valve 10 by valve closing spring 21 
during is switched off
If , during { TAIL ~ the activation process } of gas exchange valve 10 , { HEAD ~ the current } to magnetic valve 42 is switched off , magnetic valve 42 opens , and triggers , through the relief of hydraulic working chamber 20 , the closing process of gas exchange valve 10 by valve closing spring 21
OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH