Thus, the lip 14 a functions as a first weir for receiving the kinetic energy of rain water, thereby preventing rain water from penetrating into {HEAD ~ the interior} of {TAIL ~ the groove portion} 12 
of
Thus , the lip 14 a functions as a first weir for receiving the kinetic energy of rain water , thereby preventing rain water from penetrating into { HEAD ~ the interior } of { TAIL ~ the groove portion } 12
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 HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH