[每日一水] Latex Tikz foreach 循环嵌套

\documentclass{
    
    article}
\usepackage{
    
    tikz}
\begin{
    
    document}
\begin{
    
    tikzpicture}
\foreach[count=\i] \x in {
    
    20,18,...,2}
    \foreach[count=\j] \y in {
    
    20,18,...,2}
        \node at (\i,\j) {
    
    \x \y};
\end{
    
    tikzpicture}
\end{
    
    document}

\node at (\i,\j) {\x \y}; 就是写文本的意思