diff --git a/bisimilarity/src/bisimilarity_paige_tarkan.rs b/bisimilarity/src/bisimilarity_paige_tarjan.rs
similarity index 100%
rename from bisimilarity/src/bisimilarity_paige_tarkan.rs
rename to bisimilarity/src/bisimilarity_paige_tarjan.rs
diff --git a/bisimilarity/src/lib.rs b/bisimilarity/src/lib.rs
index 64b7559..5f94ec0 100644
--- a/bisimilarity/src/lib.rs
+++ b/bisimilarity/src/lib.rs
@@ -1,5 +1,5 @@
 pub mod bisimilarity_kanellakis_smolka;
-pub mod bisimilarity_paige_tarkan;
+pub mod bisimilarity_paige_tarjan;
 
 #[cfg(test)]
 mod test_kenallakis_smolka;
diff --git a/bisimilarity/src/test_paige_tarjan.rs b/bisimilarity/src/test_paige_tarjan.rs
index 3de4da9..74cda0e 100644
--- a/bisimilarity/src/test_paige_tarjan.rs
+++ b/bisimilarity/src/test_paige_tarjan.rs
@@ -1,4 +1,4 @@
-use super::bisimilarity_paige_tarkan::{
+use super::bisimilarity_paige_tarjan::{
     bisimilarity, bisimilarity_ignore_labels,
 };
 
diff --git a/execution/src/presets.rs b/execution/src/presets.rs
index e894151..094a2ea 100644
--- a/execution/src/presets.rs
+++ b/execution/src/presets.rs
@@ -702,7 +702,7 @@ where
         "{}",
         // bisimilarity::bisimilarity_kanellakis_smolka::bisimilarity(&&a, &&b)
         // bisimilarity::bisimilarity_paige_tarjan::bisimilarity_ignore_labels(&&a, &&b)
-        bisimilarity::bisimilarity_paige_tarkan::bisimilarity(&&a, &&b)
+        bisimilarity::bisimilarity_paige_tarjan::bisimilarity(&&a, &&b)
     ))
 }
 
diff --git a/grammar_separated/src/instructions.lalrpop b/grammar_separated/src/instructions.lalrpop
index 1120da6..ff831ba 100644
--- a/grammar_separated/src/instructions.lalrpop
+++ b/grammar_separated/src/instructions.lalrpop
@@ -456,26 +456,3 @@ pub ColorEdge: graph::EdgeColor = {
 }
 
 // -----------------------------------------------------------------------------
-
-// pub GraphSaveOptions: presets::GraphSaveOptions = {
-//     "Dot"
-//           "|"? <s_node: SeparatorNode>
-//           "|" <s_edge: SeparatorEdge>
-//           "|" <c_node: ColorNode>
-//           "|" <c_edge: ColorEdge>
-//           ">" <so: SaveOptions> =>
-//         presets::GraphSaveOptions::Dot { node_display: s_node,
-//                                          edge_display: s_edge,
-//                                          node_color:   c_node,
-//                                          edge_color:   c_edge,
-//                                          so },
-//     "GraphML"
-//           "|"? <s_node: SeparatorNode>
-//           "|" <s_edge: SeparatorEdge>
-//           ">" <so: SaveOptions> =>
-//         presets::GraphSaveOptions::GraphML { node_display: s_node,
-//                                              edge_display: s_edge,
-//                                              so },
-//     "Serialize" "(" <path: Path> ")" =>
-//         presets::GraphSaveOptions::Serialize { path },
-// }
diff --git a/testing/counting.system b/testing/counting.system
new file mode 100644
index 0000000..7e01617
--- /dev/null
+++ b/testing/counting.system
@@ -0,0 +1,33 @@
+Environment: []
+Initial Entities: {p1,p3}
+Context: [{}.{inc}.{inc}.{dec}.{dec,inc}.nill]
+Reactions: (
+[{p0}, {dec, inc}, {p0}];
+[{p1}, {dec, inc}, {p1}];
+[{p2}, {dec, inc}, {p2}];
+[{p3}, {dec, inc}, {p3}];
+
+[{inc}, {dec, p0}, {p0}];
+[{inc, p0}, {dec, p1}, {p1}];
+[{inc, p0, p1}, {dec, p2}, {p2}];
+[{inc, p0, p1, p2}, {dec, p3}, {p3}];
+
+[{inc, p1},{dec, p0},{p1}];
+[{inc, p2},{dec, p0},{p2}];
+[{inc, p3},{dec, p0},{p3}];
+[{inc, p2},{dec, p1},{p2}];
+[{inc, p3},{dec, p1},{p3}];
+[{inc, p3},{dec, p2},{p3}];
+
+[{dec},{inc, p0},{p0}];
+[{dec},{inc, p0, p1},{p1}];
+[{dec},{inc, p0, p1, p2},{p2}];
+[{dec},{inc, p0, p1, p2, p3},{p3}];
+
+[{dec, p0, p1},{inc},{p1}];
+[{dec, p0, p2},{inc},{p2}];
+[{dec, p0, p3},{inc},{p3}];
+[{dec, p1, p2},{inc},{p2}];
+[{dec, p1, p3},{inc},{p3}];
+[{dec, p2, p3},{inc},{p3}];
+)