diff --git a/char.go b/char.go
index db4a0e7..25204bf 100644
--- a/char.go
+++ b/char.go
@@ -48,9 +48,9 @@ func (p *charParser) commitType() CommitType {
 }
 
 func (p *charParser) setIncludedBy(includedBy parser, parsers *idSet) {
-	if parsers.has(p.id) {
-		panic(cannotIncludeParsers(p.name))
-	}
+	// if parsers.has(p.id) {
+	// 	panic(cannotIncludeParsers(p.name))
+	// }
 
 	p.includedBy = append(p.includedBy, includedBy)
 }
diff --git a/choice.go b/choice.go
index 522e9e3..4d75a52 100644
--- a/choice.go
+++ b/choice.go
@@ -78,9 +78,9 @@ func (p *choiceParser) nodeName() string { return p.name }
 func (p *choiceParser) nodeID() int      { return p.id }
 
 func (p *choiceParser) setIncludedBy(includedBy parser, parsers *idSet) {
-	if parsers.has(p.id) {
-		return
-	}
+	// if parsers.has(p.id) {
+	// 	return
+	// }
 
 	p.includedBy = append(p.includedBy, includedBy)
 }
@@ -100,22 +100,22 @@ func (p *choiceParser) storeIncluded(c *context, n *Node) {
 }
 
 func (p *choiceParser) parse(t Trace, c *context) {
-	// t = t.Extend(p.name)
-	// t.Out1("parsing choice", c.offset)
+	t = t.Extend(p.name)
+	t.Out1("parsing choice", c.offset)
 
 	if p.commit&Documentation != 0 {
-		// t.Out1("fail, doc")
+		t.Out1("fail, doc")
 		c.fail(c.offset)
 		return
 	}
 
-	if _, ok := c.fromStore(p.id); ok {
-		// t.Out1("found in store, match:", m)
+	if m, ok := c.fromStore(p.id); ok {
+		t.Out1("found in store, match:", m)
 		return
 	}
 
 	if c.excluded(c.offset, p.id) {
-		// t.Out1("excluded")
+		t.Out1("excluded")
 		c.fail(c.offset)
 		return
 	}
@@ -156,13 +156,13 @@ func (p *choiceParser) parse(t Trace, c *context) {
 	}
 
 	if match {
-		// t.Out1("choice, success")
+		t.Out1("choice, success")
 		c.success(node)
 		c.include(initialOffset, p.id)
 		return
 	}
 
-	// t.Out1("fail")
+	t.Out1("fail")
 	c.store.set(node.From, p.id, nil)
 	c.fail(node.From)
 	c.include(initialOffset, p.id)
diff --git a/mml_test.go b/mml_test.go
index 554a0eb..fb519a5 100644
--- a/mml_test.go
+++ b/mml_test.go
@@ -9,7 +9,7 @@ import (
 )
 
 func TestMML(t *testing.T) {
-	test(t, "mml.parser", "mml", []testItem{{
+	testTrace(t, "mml.parser", "mml", 1, []testItem{{
 		msg:  "empty",
 		node: &Node{Name: "mml"},
 	}, {
diff --git a/sequence.go b/sequence.go
index de54591..d27d394 100644
--- a/sequence.go
+++ b/sequence.go
@@ -99,9 +99,9 @@ func (p *sequenceParser) nodeName() string { return p.name }
 func (p *sequenceParser) nodeID() int      { return p.id }
 
 func (p *sequenceParser) setIncludedBy(includedBy parser, parsers *idSet) {
-	if parsers.has(p.id) {
-		return
-	}
+	// if parsers.has(p.id) {
+	// 	return
+	// }
 
 	p.includedBy = append(p.includedBy, includedBy)
 }
@@ -121,17 +121,17 @@ func (p *sequenceParser) storeIncluded(c *context, n *Node) {
 }
 
 func (p *sequenceParser) parse(t Trace, c *context) {
-	// t = t.Extend(p.name)
-	// t.Out1("parsing sequence", c.offset)
+	t = t.Extend(p.name)
+	t.Out1("parsing sequence", c.offset)
 
 	if p.commit&Documentation != 0 {
-		// t.Out1("fail, doc")
+		t.Out1("fail, doc")
 		c.fail(c.offset)
 		return
 	}
 
 	if c.excluded(c.offset, p.id) {
-		// t.Out1("excluded")
+		t.Out1("excluded")
 		c.fail(c.offset)
 		return
 	}
@@ -157,7 +157,7 @@ func (p *sequenceParser) parse(t Trace, c *context) {
 
 		if !m {
 			if currentCount < ranges[0][0] {
-				// t.Out1("fail, item failed")
+				t.Out1("fail, item failed")
 				// c.store.set(node.From, p.id, nil)
 				c.fail(node.From)
 				c.include(initialOffset, p.id)
@@ -186,7 +186,7 @@ func (p *sequenceParser) parse(t Trace, c *context) {
 		}
 	}
 
-	// t.Out1("success, items parsed")
+	t.Out1("success, items parsed")
 
 	// c.store.set(node.From, p.id, node)
 	for _, includedBy := range p.includedBy {