diff --git a/libmwereader/test_mwe.xml b/libmwereader/test_mwe.xml
index bf4a0713bc55b0a6609e0a60eafcdc7da055f963..024377d470579ac83cbb77c61e2e3d760ed226a1 100644
--- a/libmwereader/test_mwe.xml
+++ b/libmwereader/test_mwe.xml
@@ -41,5 +41,39 @@
</MWE>
</instances>
</mwegroup>
+ <mwegroup name="SubstAdjSgFlex" type="flex" class="subst">
+ <condition>
+ or(
+ and(
+ inter(base[1],$s:Adj),
+ inter(class[1],{adj}),
+ inter(base[0],$s:Subst),
+ equal(nmb[0], {sg}),
+ in(class[0],{subst,ger,depr}),
+ agrpp(0,1,{nmb,gnd,cas})
+ ),//and
+ and(
+ inter(base[0],$s:Adj),
+ inter(class[0],{adj}),
+ inter(base[1],$s:Subst),
+ equal(nmb[1],{sg}),
+ in(class[1],{subst,ger,depr}),
+ agrpp(0,1,{nmb,gnd,cas})
+ )
+ )//or
+ </condition>
+ <instances>
+ <MWE base="akt notarialny">
+ <var name="Subst">akt</var>
+ <var name="Adj">notarialny</var>
+ <head>in(class[0],{subst,ger,depr})</head>
+ </MWE>
+ <MWE base="areszt tymczasowy">
+ <var name="Subst">areszt</var>
+ <var name="Adj">tymczasowy</var>
+ <head>in(class[0],{subst,ger,depr})</head>
+ </MWE>
+ </instances>
+ </mwegroup>
</units_description>