diff --git a/calc2.py b/calc2.py
index 1912b5a..1327c8e 100644
--- a/calc2.py
+++ b/calc2.py
@@ -206,7 +206,7 @@ targets_groups: list[dict[str, float]] = [
     {'science-purple': SPM},
     {'science-yellow': SPM},
 ]
-base_resources = {
+bus_resources = {
     'iron-plate',
     'copper-plate',
     'stone',
@@ -222,10 +222,10 @@ base_resources = {
 # TODO: science-blue is wrong
 
 print(f'{SPM=}')
-print(f'{base_resources=}')
+print(f'{bus_resources=}')
 bus_inputs = {}
 for targets in targets_groups:
-    results, intermediates = compute_base_resource_flow(targets, base_resources)
+    results, intermediates = compute_base_resource_flow(targets, bus_resources)
     print()
     print(f'{targets=}')
     print('intermediates')
@@ -243,3 +243,13 @@ for resource, count in sorted(bus_inputs.items()):
     if resource.startswith(('assembler', 'chemical-plant', 'oil-refinery')):
         continue
     print(f'    {resource:35}: {dot_align(tuple(bus_inputs.values()), count)}')
+
+# oil processing
+oil_resources = {
+    'sulfuric-acid',
+    'light-oil',
+    'heavy-oil',
+}
+
+oil_inputs = {}
+# TODO compute