diff --git a/Makefile b/Makefile
index c75e83c..506acbf 100644
--- a/Makefile
+++ b/Makefile
@@ -199,13 +199,13 @@ oarcs-base.owl: oarcs.owl
 			--trim false \
 			--output $@
 
-ontologies-merged.ttl: mirror
+ontologies-merged.ttl: mirror unmerge.ofn
 	$(ROBOT) merge $(addprefix -i mirror/,$(shell ls mirror)) \
 	remove --axioms 'disjoint' --trim true --preserve-structure false \
 	remove --term 'owl:Nothing' --trim true --preserve-structure false \
-	query --update build-sparql/filter-bad-uri-values.ru \
+	unmerge -i unmerge.ofn \
 	reason -r ELK -D debug.ofn -o $@.owl &&\
-	$(RIOT) -q --nocheck --stream=ntriples $@.owl >$@
+	$(RIOT) -q --nocheck --output=turtle $@.owl >$@
 
 ontologies-merged.ofn.gz: ontologies-merged.ttl
 	$(ROBOT) convert -i $< -o ontologies-merged.ofn && gzip ontologies-merged.ofn
diff --git a/unmerge.ofn b/unmerge.ofn
new file mode 100644
index 0000000..9139665
--- /dev/null
+++ b/unmerge.ofn
@@ -0,0 +1,18 @@
+Prefix(:=<http://purl.obolibrary.org/obo/go.owl#>)
+Prefix(dc:=<http://purl.org/dc/elements/1.1/>)
+Prefix(go:=<http://purl.obolibrary.org/obo/go#>)
+Prefix(obo:=<http://purl.obolibrary.org/obo/>)
+Prefix(owl:=<http://www.w3.org/2002/07/owl#>)
+Prefix(rdf:=<http://www.w3.org/1999/02/22-rdf-syntax-ns#>)
+Prefix(xml:=<http://www.w3.org/XML/1998/namespace>)
+Prefix(xsd:=<http://www.w3.org/2001/XMLSchema#>)
+Prefix(obo1:=<http://www.geneontology.org/formats/oboInOwl#http://purl.obolibrary.org/obo/>)
+Prefix(rdfs:=<http://www.w3.org/2000/01/rdf-schema#>)
+Prefix(terms:=<http://purl.org/dc/terms/>)
+Prefix(terms2:=<http://www.geneontology.org/formats/oboInOwl#http://purl.org/dc/terms/>)
+Prefix(oboInOwl:=<http://www.geneontology.org/formats/oboInOwl#>)
+
+
+Ontology(
+AnnotationAssertion(obo:IAO_0000233 obo:GO_0034512 "- [ ] box C/D RNA 5'-end processing -> box C/D sno(s)RNA 5'-end processing"^^xsd:anyURI)
+)