examples/README.md

@@ -19,8 +19,3 @@ Extends R to have necessitation with the following additional axioms:
 3) (!p & !q) -> !(p & q)
 
 Output contains all satisfiable models up to size 3.
-
-## R5-S5
-
-Extends R with axioms that classically are adequate for S5 giving rise to an R-ish version of S5 with necessitation.
-

parse_magic.py

@@ -58,13 +58,14 @@ def parse_matrices(infile: SourceFile) -> List[Tuple[Model, Dict]]:
 def process_sizes(infile: SourceFile, header: UglyHeader, current_model_parts: ModelBuilder, solutions: List[Tuple[Model, Dict]]):
     """Stage 1"""
 
-    first_run = True
+    # NOTE: In R3-PN the first size line is -1?
+    if header.necessitation:
+        next(infile)
 
     while True:
         print("Processing next size")
         try:
-            size = parse_size(infile, first_run)
-            first_run = False
+            size = parse_size(infile)
         except StopIteration:
             # For some reason, when necessitation is enabled this doesn't
             # have a -1 on the last line
@@ -218,15 +219,11 @@ def carrier_set_from_size(size: int):
         mvalue_from_index(i) for i in range(size + 1)
     }
 
-def parse_size(infile: SourceFile, first_run: bool) -> Optional[int]:
+def parse_size(infile: SourceFile) -> Optional[int]:
     """
     Parse the line representing the matrix size.
     """
     size = int(next(infile))
-    # HACK: The first size line may be -1 due to a bug. Skip it
-    if size == -1 and first_run:
-        size = int(next(infile))
-
     if size == -1:
         return None
     assert size > 0, f"Unexpected size at line {infile.current_line}"