Clash of Rhombuses

Round 19

Statement

    Equilateral triangle $\triangle ABC$ is divided into $2018^2$ smaller congruent equilateral triangles (with sides parallel to its sides). Let $m$ be the number of rhombuses that contain two small equilateral triangles and $d$ the number of rhombuses that contain eight small equilateral triangles. Find the difference $m-d\ .$
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