--- a
+++ b/singlecellmultiomics/modularDemultiplexer/demultiplexModules/Hexamer.py
@@ -0,0 +1,61 @@
+from singlecellmultiomics.modularDemultiplexer.baseDemultiplexMethods import DemultiplexingStrategy
+from singlecellmultiomics.modularDemultiplexer.baseDemultiplexMethods import NonMultiplexable
+from singlecellmultiomics.modularDemultiplexer.baseDemultiplexMethods import TaggedRecord
+from singlecellmultiomics.modularDemultiplexer.baseDemultiplexMethods import TagDefinitions
+
+
+# ask buys or annaa about it
+
+class HexamerBaseDemultiplexer(DemultiplexingStrategy):
+
+    def __init__(
+            self,
+            indexFileParser,
+            illuminaIndicesAlias='illumina_merged_iPCR_RP',
+            **kwargs):
+        self.barcodeFileParser = None
+        DemultiplexingStrategy.__init__(self)
+        self.indexFileParser = indexFileParser
+        self.illuminaIndicesAlias = illuminaIndicesAlias
+        self.shortName = 'HEX'
+        self.longName = 'HexamersDemux'
+        self.autoDetectable = False
+        self.hexLength = 6
+        self.description = 'Demultiplex as a bulk sample and add hexamer H0..H3 tags'
+        self.barcodeSummary = 'Bulk, no cell barcodes'
+        self.indexSummary = f'sequencing indices: {illuminaIndicesAlias}'
+
+    def demultiplex(self, records, library=None, **kwargs):
+        global TagDefinitions
+
+        try:
+            h0 = records[0].sequence[:self.hexLength]
+            h1 = records[0].qual[:self.hexLength]
+            if len(records) > 1:
+                h2 = records[1].sequence[:self.hexLength]
+                h3 = records[1].qual[:self.hexLength]
+            trs = []
+            for record in records:
+                t = TaggedRecord(
+                    rawRecord=record,
+                    tagDefinitions=TagDefinitions,
+                    indexFileParser=self.indexFileParser,
+                    indexFileAlias=self.illuminaIndicesAlias,
+                    library=library)
+                t.addTagByTag('H0', h0, isPhred=False)
+                t.addTagByTag('H1', h1, isPhred=True)
+                if len(records) > 1:
+                    t.addTagByTag('H2', h2, isPhred=False)
+                    t.addTagByTag('H3', h3, isPhred=True)
+                trs.append(
+                    t.asFastq(
+                        record.sequence,
+                        record.plus,
+                        record.qual))
+
+            return trs
+
+        except NonMultiplexable:
+            raise
+        except Exception as e:
+            print(e)