Mikael Henriksson
--- a/b_asic/resources.py 0 → 100644
+++ b/b_asic/resources.py 0 → 100644
+        pos=nx.spring_layout(exclusion_graph, seed=1),
+    )
+
+
+class ProcessCollection:
+    """
+    Collection of one or more processes
+
+    Parameters
+    ----------
+    collection : set of :class:`~b_asic.process.Process` objects, optional
+    """
+
+    def __init__(self, collection: Optional[Set[Process]] = None):
+        if collection is None:
+            self._collection = set[Process]()
-            self._collection = set[Process]()
+            self._collection = Set[Process]()