root:
             creates   file:./
             creates   file:plan.py
             creates   step:./plan.py

file:./
               state = STATIC
          created by   root:
            supplies   file:data1.json
            supplies   file:data2.json
            supplies   file:generate.py
            supplies   file:plan.py
            supplies   step:./generate.py '{"size": 10}' --out=data1.json
            supplies   step:./generate.py '{"size": 20}' --out=data2.json
            supplies   step:./plan.py

file:plan.py
               state = STATIC
          created by   root:
            consumes   file:./
            supplies   step:./plan.py

step:./plan.py
               state = SUCCEEDED
          created by   root:
            consumes   file:./
            consumes   file:plan.py
             creates   file:generate.py
             creates   step:./generate.py '{"size": 10}' --out=data1.json
             creates   step:./generate.py '{"size": 20}' --out=data2.json

file:generate.py
               state = STATIC
          created by   step:./plan.py
            consumes   file:./
            supplies   step:./generate.py '{"size": 10}' --out=data1.json
            supplies   step:./generate.py '{"size": 20}' --out=data2.json

step:./generate.py '{"size": 10}' --out=data1.json
               state = SUCCEEDED
          created by   step:./plan.py
            consumes   file:./
            consumes   file:generate.py
             creates   file:data1.json
            supplies   file:data1.json

file:data1.json
               state = BUILT
          created by   step:./generate.py '{"size": 10}' --out=data1.json
            consumes   file:./
            consumes   step:./generate.py '{"size": 10}' --out=data1.json

step:./generate.py '{"size": 20}' --out=data2.json
               state = SUCCEEDED
          created by   step:./plan.py
            consumes   file:./
            consumes   file:generate.py
             creates   file:data2.json
            supplies   file:data2.json

file:data2.json
               state = BUILT
          created by   step:./generate.py '{"size": 20}' --out=data2.json
            consumes   file:./
            consumes   step:./generate.py '{"size": 20}' --out=data2.json
