{TAIL ~ The method} 1, which comprises the steps of cutting the notches extending in the array direction and a direction perpendicular to the array direction and providing {HEAD ~ a plurality} of transducer elements extending in the array direction 
{ TAIL ~ The method } 1 , which comprises the steps of cutting the notches extending in the array direction and a direction perpendicular to the array direction and providing { HEAD ~ a plurality } of transducer elements extending in the array direction
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