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Suppose there are $n$ houses along a straight country road and each house has a position $x_1$ along the road. $($You can assume that the house positions are given to you in increasing order: $xcxc-5xc+5(x_1,x_2,$dots,$x_n)(c_1,c_2,$dots,$c_k)x_1(x_1.)$ collection $of$ ell towers that you can build any where along vish.