plot[sinc(x-2.5)*sinc(3x-7.5)+sinc(x-1.5)*sinc(3x-4.5)+sinc(x-0.5)*sinc(3x-1.5)+sinc(x+0.5)*sinc(3x+1.5)+sinc(x+1.5)*sinc(3x+4.5)+sinc(x+2.5)*sinc(3x+7.5),x=-2..2]

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