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我尝试用 Latex 制作这个流程图，但不知道如何制作向左下方的框。请帮忙，因为我尽可能提供下面的代码。
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows}
\usetikzlibrary{positioning}
\begin{document}
\begin{tikzpicture}[
> = latex',
every node/.style={
draw,
minimum width=2cm,
minimum height=0.8cm,
},
]
%
\node (S1) {Step 1};
%
\node[below=of S1] (S2) {Step 2};
\node[below=of S1, left=of S2] (S3) {Step 3};
\node[below=of S1, right=of S2] (S4) {Step 4};
\node[below=of S2] (S2a) {Step 2a};
\node[below=of S3] (S3a) {Step 3a};
\node[below=of S4] (S4a) {Step 4a};
\node[below=of S2a] (S2b) {Step 2b};
\node[below=of S3a] (S3b) {Step 3b};
\node[below=of S4a] (S4b) {Step 4b};
\node[below=of S2b] (S2c) {Step 2c};
\node[below=of S3b] (S3c) {Step 3c};
\node[below=of S4b] (S4c) {Step 4c};
\node[below=of S2c] (S2d) {Step 2d};
\node[below=of S3c] (S3d) {Step 3d};
\node[below=of S4c] (S4d) {Step 4d};
\draw[->]
(S1) edge (S2)
(S2) edge (S3);
\end{tikzpicture}
\end{document}
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