By coating {TAIL ~ an upper part} of {HEAD ~ the groove} with, for example, a sealing agent, the capillary channel may be formed 
By coating { TAIL ~ an upper part } of { HEAD ~ the groove } with , for example , a sealing agent , the capillary channel may be formed
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH