{HEAD ~ The present invention} relates to {TAIL ~ an optical multi wavelength selective device}, more precisely a multi wavelength selective switch for rerouting and switching of wavelengths in an optical network, in which each wavelength may be separately rerouted 
relates to
{ HEAD ~ The present invention } relates to { TAIL ~ an optical multi wavelength selective device } , more precisely a multi wavelength selective switch for rerouting and switching of wavelengths in an optical network , in which each wavelength may be separately rerouted
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