digraph L {
  node [shape=rectangle];

  a  [label="[Node A]\lStep 1: f1(A)\lStep 2: f2(A)\lStep 3: f3(A)\l"]
  b  [label="[Node B]\lStep 1: f1(B)\lStep 2: f2(B)\lStep 3: f3(B)\l"]
  c  [label="[Node C]\lStep 1: f1(C)\lStep 2: f2(C)\lStep 3: f3(C)\l"]

  a -> b;
  a -> c;
}