diff --git a/pash_annotations/annotation_generation/annotation_generators/InputOutputInfoGeneratorCustom.py b/pash_annotations/annotation_generation/annotation_generators/InputOutputInfoGeneratorCustom.py
new file mode 100644
index 0000000..16f8034
--- /dev/null
+++ b/pash_annotations/annotation_generation/annotation_generators/InputOutputInfoGeneratorCustom.py
@@ -0,0 +1,22 @@
+from pash_annotations.annotation_generation.annotation_generators.InputOutputInfoGenerator_Interface import InputOutputInfoGeneratorInterface
+from pash_annotations.datatypes.BasicDatatypes import Operand
+
+
+class InputOutputInfoGeneratorGrep(InputOutputInfoGeneratorInterface):
+
+    def generate_info(self) -> None:
+        #no flags case
+        self.set_implicit_use_of_stdout()
+        """
+        if self.does_flag_option_list_contain_at_least_one_of(["-e", "-f"]):
+            if self.get_operand_list_length() == 0:
+                self.set_implicit_use_of_stdin()
+            else:
+                self.all_operands_are_streaming_inputs() # this is true also if empty
+        """
+        #else:
+        self.set_first_operand_as_config_arg_type_string()
+        if self.get_operand_list_length() == 1:
+            self.set_implicit_use_of_stdin()
+        else:
+            self.all_but_first_operand_is_streaming_input()
diff --git a/pash_annotations/annotation_generation/annotation_generators/ParallelizabilityInfoGeneratorCustom.py b/pash_annotations/annotation_generation/annotation_generators/ParallelizabilityInfoGeneratorCustom.py
new file mode 100644
index 0000000..0dcbde3
--- /dev/null
+++ b/pash_annotations/annotation_generation/annotation_generators/ParallelizabilityInfoGeneratorCustom.py
@@ -0,0 +1,74 @@
+from pash_annotations.annotation_generation.annotation_generators.ParallelizabilityInfoGenerator_Interface import ParallelizabilityInfoGeneratorInterface
+from pash_annotations.annotation_generation.datatypes.parallelizability.Parallelizer import \
+    AdditionalInfoSplitterToMapper, make_parallelizer_round_robin, make_parallelizer_consec_chunks
+from pash_annotations.annotation_generation.datatypes.parallelizability.MapperSpec import make_mapper_spec_custom
+from pash_annotations.annotation_generation.datatypes.parallelizability.AggregatorSpec import \
+    make_aggregator_spec_custom_2_ary_from_string_representation
+
+
+class ParallelizabilityInfoGeneratorGrep(ParallelizabilityInfoGeneratorInterface):
+
+    #base case with grep parallelizability info
+    def generate_info(self) -> None:
+            mapper_spec = None
+            aggregator_spec = None
+            add_info_from_splitter = None
+            
+            if (mapper_spec is None or mapper_spec.is_implemented) and \
+                    (aggregator_spec is None or aggregator_spec.is_implemented):
+                parallelizer_cc = make_parallelizer_consec_chunks(mapper_spec=mapper_spec,
+                                                                  aggregator_spec=aggregator_spec,
+                                                                  info_splitter_mapper=add_info_from_splitter)
+                self.append_to_parallelizer_list(parallelizer_cc)
+                parallelizer_rr = make_parallelizer_round_robin(mapper_spec=mapper_spec,
+                                                                 aggregator_spec=aggregator_spec,
+                                                                 info_splitter_mapper=add_info_from_splitter)
+                self.append_to_parallelizer_list(parallelizer_rr)
+
+
+
+""""
+from pash_annotations.annotation_generation.annotation_generators.ParallelizabilityInfoGenerator_Interface import ParallelizabilityInfoGeneratorInterface
+from pash_annotations.annotation_generation.datatypes.parallelizability.AggregatorSpec import \
+    make_aggregator_spec_custom_2_ary_from_string_representation
+from pash_annotations.annotation_generation.datatypes.parallelizability.MapperSpec import \
+    make_mapper_spec_custom_from_string_representation
+from pash_annotations.annotation_generation.datatypes.parallelizability.Parallelizer import make_parallelizer_round_robin, \
+    make_parallelizer_consec_chunks
+from pash_annotations.annotation_generation.datatypes.parallelizability.Parallelizer import Parallelizer
+from pash_annotations.annotation_generation.datatypes.parallelizability.AggregatorSpec import \
+    make_aggregator_spec_custom_n_ary_from_string_representation
+
+class ParallelizabilityInfoGeneratorCustom(ParallelizabilityInfoGeneratorInterface):
+    # info to provide: parallelizer_list, round_robin_comp_with_cat, is_commutative (for optimisations)
+    # parallelizabilityinfo has to-do to remove round_robin_comp_with_cat?
+
+    def generate_info(self, parallelizer_list:Parallelizer, round_robin_comp_with_cat:bool, is_commutative:bool, aggregator_spec:str) -> None:
+        if is_commutative:
+            self.parallelizability_info.set_commutative()
+        #mapper spec?
+        #mapper_spec = make_mapper_spec_custom_from_string_representation("alt_bigrams_aux", is_implemented=True)
+
+        if (mapper_spec is None or mapper_spec.is_implemented) and \
+            (aggregator_spec is None or aggregator_spec.is_implemented):
+               parallelizer_cc = make_parallelizer_consec_chunks(mapper_spec=mapper_spec,
+                                                                  aggregator_spec=aggregator_spec,
+                                                                  info_splitter_mapper=add_info_from_splitter)
+            self.append_to_parallelizer_list(parallelizer_cc)
+            parallelizer_rr = make_parallelizer_round_robin(mapper_spec=mapper_spec,
+                                                                 aggregator_spec=aggregator_spec,
+                                                                 info_splitter_mapper=add_info_from_splitter)
+            self.append_to_parallelizer_list(parallelizer_rr)
+        if round_robin_comp_with_cat:
+            aggregator_spec_custom_rr = make_aggregator_spec_custom_2_ary_from_string_representation(aggregator_spec,
+                                                                                       is_implemented=False)
+            parallelizer_rr = make_parallelizer_round_robin(mapper_spec=None,
+                                                                 aggregator_spec=aggregator_spec_custom_rr,
+                                                                 info_splitter_mapper=None)
+            self.append_to_parallelizer_list(parallelizer_rr)
+
+        #how should the parallelizability info generator handle aggregators, i.e taking in file 
+        agg_spec_custom_cc = make_aggregator_spec_custom_n_ary_from_string_representation(aggregator_spec)
+        parallelizer_cc = make_parallelizer_consec_chunks(aggregator_spec = agg_spec_custom_cc)
+        self.parallelizability_info.append_to_parallelizer_list(parallelizer_cc)
+"""
\ No newline at end of file