{HEAD ~ The fabrication techniques} of {TAIL ~ the invention} may be used to produce optical couplers, gratings, and other multilayer devices of arbitrary shape for use with optical systems, in integrated circuit systems, and the like, where multilayered structures are needed 
{ HEAD ~ The fabrication techniques } of { TAIL ~ the invention } may be used to produce optical couplers , gratings , and other multilayer devices of arbitrary shape for use with optical systems , in integrated circuit systems , and the like , where multilayered structures are needed
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