The infinite sequence x1, x2, . . . , xn is such that x1 = 3, x2 = 5, x3 = –1, x4 = 7, and xn = xn–4, for all n > 4. What is the sum of the first 102 terms of the sequence?

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The infinite sequence <em>x</em><sub>1</sub>, <em>x</em><sub>2</sub>, . . . , <em>x</em><sub>n</sub> is such that <em>x</em><sub>1</sub> = 3, <em>x</em><sub>2</sub> = 5, <em>x</em><sub>3</sub> = –1, <em>x</em><sub>4</sub> = 7, and <em>x</em><em><sub>n</sub></em> = <em>x</em><sub><em>n</em>–4</sub>, for all<em> n </em>> 4. What is the sum of the first 102 terms of the sequence?