digraph techviz {
  graph [rankdir=TB, splines=ortho, nodesep=0.55, ranksep=0.85];
  node [fontname=Helvetica, fontsize=11, margin="0.18,0.12", style="rounded,filled", fillcolor=white, color="#2d4357", penwidth=1.5];
  edge [fontname=Helvetica, fontsize=10, color="#364b5f", penwidth=1.4, arrowsize=0.75];
  n0 [label="예측을 먼저 적는다", shape=box, style="rounded,filled"];
  n1 [label="주입이 걸렸는지 확인", shape=box, style="rounded,filled"];
  n2 [label="대조군을 잡는다", shape=box, style="rounded,filled"];
  n3 [label="결론", shape=box, style="rounded,filled"];
  n0 -> n1 [label="주입 뒤", style=solid];
  n1 -> n2 [label="관측 전", style=solid];
  n2 -> n3 [label="귀속", style=solid];
}