diff --git a/src/main.nf b/src/main.nf
index e60107b8555ef5a4a31b417bf1158e5bc1161da2..b008decf6a746e5a257d48ff4b208625f09e4e7c 100644
--- a/src/main.nf
+++ b/src/main.nf
@@ -7,6 +7,7 @@ Testing pipeline for marseq scRNASeq analysis
 include { SPLIT } from "./modules/split"
 include { FASTKMERS } from "./modules/fastkmers"
 include { MERGEKMER } from "./modules/mergekmer"
+include { MERGEKMER2 } from "./modules/mergekmer"
 include { COLLATEKMER } from "./modules/mergekmer"
 
 
@@ -23,6 +24,7 @@ Channel.fromPath( file(params.csv) )
 workflow {
   SPLIT(fastq.r1.mix(fastq.r2))
   FASTKMERS(SPLIT.out.fastq.transpose())
-  MERGEKMER(FASTKMERS.out.csv.groupTuple())
-  COLLATEKMER(MERGEKMER.out.csv)
+  MERGEKMER(FASTKMERS.out.csv.groupTuple(size: 10))
+  MERGEKMER2(MERGEKMER.out.csv.groupTuple())
+  COLLATEKMER(MERGEKMER2.out.csv)
 }