diff --git a/src/JobShopParser/__init__.py b/src/JobShopParser/__init__.py
index 51df1c2..40615f6 100644
--- a/src/JobShopParser/__init__.py
+++ b/src/JobShopParser/__init__.py
@@ -83,8 +83,13 @@ class JobShopVisitor(arpeggio.PTNodeVisitor):
     def visit_problem_data(self, node: arpeggio.ParseTreeNode, children: arpeggio.SemanticActionResults) -> JobShopProblem:
         if self.debug:
             print("problem_data\nchildren:", children)
+        # filter out newlines or other strings
         cleaned_data = list(filter(lambda x: type(x) is not str, children))
         problem_data: List[List[Tuple(int, int)]] = [ cleaned_data[i] for i in range(2, len(cleaned_data))]
-        return JobShopProblem(children[0], children[1], problem_data)
+        problem = JobShopProblem(children[0], children[1], problem_data)
+        if self.debug:
+            print("\nreturning a", type(problem), "\n")
+            print("problem_data:", problem_data)
+        return problem
 
 
diff --git a/src/JobShopParser/jobshop2_parser.py b/src/JobShopParser/jobshop2_parser.py
index dc49898..43b6d30 100644
--- a/src/JobShopParser/jobshop2_parser.py
+++ b/src/JobShopParser/jobshop2_parser.py
@@ -5,7 +5,14 @@ from typing import List, Tuple, Sequence, Optional, Union
 from . import grammar, JobShopVisitor, JobShopProblem
 
 class JobShop2Visitor(JobShopVisitor):
-    pass
+
+    def visit_job_shop2(self, node: arpeggio.ParseTreeNode, children: arpeggio.SemanticActionResults) -> JobShopProblem:
+        if self.debug:
+            print("job_shop2:\nchildren:", children)
+        problem = children[0]
+        if self.debug:
+            print("returning a", type(problem))
+        return problem
 
 def parse_jobshop2_file(filename: Union[str, bytes]) -> JobShopProblem:
     """Open file with jobshop2-formatted data (single problem instance, no name & description),
@@ -17,7 +24,7 @@ def parse_jobshop2_file(filename: Union[str, bytes]) -> JobShopProblem:
         return arpeggio.visit_parse_tree(parse_tree, JobShop2Visitor())
 
 def main():
-    print(type(parse_jobshop2_file('../inputdata/jobshop2/ta13').problem_data))
+    print(type(parse_jobshop2_file('../inputdata/jobshop2/ta13')))
  
 parser = ParserPEG(grammar, "job_shop2", skipws=False)