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

file:plan.py
               state = CONFIRMED
             creator   root:
                sink   step:./plan.py

step:./plan.py
               state = SUCCEEDED
                need = PLAN
           using_env = STEPUP_PATH_FILTER [dynamic]
               nglob = inp*.txt
           explained = yes
             creator   root:
              source   file:plan.py
             product   file:inp1.txt
             product   file:subs1.txt
             product   file:work.py
             product   step:./work.py subs1.txt > subs2.txt
             product   step:./work.py subs2.txt > subs3.txt
             product   step:cp -p inp1.txt conv1.txt

file:subs1.txt
               state = CONFIRMED
             creator   step:./plan.py
                sink   step:./work.py subs1.txt > subs2.txt

file:work.py
               state = CONFIRMED
             creator   step:./plan.py
                sink   step:./work.py subs1.txt > subs2.txt
                sink   step:./work.py subs2.txt > subs3.txt

file:inp1.txt
               state = CONFIRMED
             creator   step:./plan.py
                sink   step:cp -p inp1.txt conv1.txt

step:cp -p inp1.txt conv1.txt
               state = SUCCEEDED
                need = DEFAULT
           explained = yes
             creator   step:./plan.py
              source   file:inp1.txt
             product   file:conv1.txt
                sink   file:conv1.txt

file:conv1.txt
               state = BUILT
             creator   step:cp -p inp1.txt conv1.txt
              source   step:cp -p inp1.txt conv1.txt
                sink   step:./work.py subs1.txt > subs2.txt
                sink   step:./work.py subs2.txt > subs3.txt

step:./work.py subs1.txt > subs2.txt
               state = SUCCEEDED
                need = DEFAULT
           explained = yes
             creator   step:./plan.py
              source   file:conv1.txt [dynamic]
              source   file:subs1.txt
              source   file:work.py
             product   file:subs2.txt
                sink   file:subs2.txt

file:subs2.txt
               state = BUILT
             creator   step:./work.py subs1.txt > subs2.txt
              source   step:./work.py subs1.txt > subs2.txt
                sink   step:./work.py subs2.txt > subs3.txt

step:./work.py subs2.txt > subs3.txt
               state = SUCCEEDED
                need = DEFAULT
           explained = yes
             creator   step:./plan.py
              source   file:conv1.txt [dynamic]
              source   file:subs2.txt
              source   file:work.py
             product   file:subs3.txt
                sink   file:subs3.txt

file:subs3.txt
               state = BUILT
             creator   step:./work.py subs2.txt > subs3.txt
              source   step:./work.py subs2.txt > subs3.txt
