{HEAD ~ The inner surface} of a power supply side connector is covered with {TAIL ~ a circular waterproofing packing} 
is covered with
{ HEAD ~ The inner surface } of a power supply side connector is covered with { TAIL ~ a circular waterproofing packing }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL