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tikz label coordinates using mathematical expression from foreach variables
\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\foreach \x [count=\xi from 1] in {-3.0,-2.8,...,1.8}
\draw[thin] (0,0) ++(\x,2) rectangle ++(0.2, 0.2) ...
