diff --git a/choice.go b/choice.go
index 07e4f88..e759f80 100644
--- a/choice.go
+++ b/choice.go
@@ -18,10 +18,11 @@ type choiceParser struct {
 }
 
 type choiceBuilder struct {
-	name     string
-	id       int
-	commit   CommitType
-	elements []builder
+	name       string
+	id         int
+	commit     CommitType
+	elements   []builder
+	includedBy []int
 }
 
 func newChoice(name string, ct CommitType, elements []string) *choiceDefinition {
@@ -66,6 +67,17 @@ func (d *choiceDefinition) setIncludedBy(r *registry, includedBy int, parsers *i
 	}
 
 	d.includedBy = appendIfMissing(d.includedBy, includedBy)
+
+	if d.cbuilder == nil {
+		d.cbuilder = &choiceBuilder{
+			name:   d.name,
+			id:     d.id,
+			commit: d.commit,
+		}
+	}
+
+	d.cbuilder.includedBy = appendIfMissing(d.cbuilder.includedBy, includedBy)
+
 	parsers.set(d.id)
 	return setItemsIncludedBy(r, d.elements, includedBy, parsers)
 }
@@ -203,6 +215,10 @@ func (b *choiceBuilder) build(c *context) ([]*Node, bool) {
 		return nil, false
 	}
 
+	for _, ib := range b.includedBy {
+		c.store.takeMatchLength(c.offset, ib, to)
+	}
+
 	var element builder
 	for _, e := range b.elements {
 		elementTo, match, _ := c.store.getMatch(c.offset, e.nodeID())
diff --git a/json.parser b/json.parser
index c7d40e8..de8c34d 100644
--- a/json.parser
+++ b/json.parser
@@ -1,12 +1,12 @@
 // JSON (http://www.json.org)
-ws:ws       = [ \b\f\n\r\t];
+ws:alias    = [ \b\f\n\r\t];
 true        = "true";
 false       = "false";
 null        = "null";
-string:nows = "\"" ([^\\"\b\f\n\r\t] | "\\" (["\\/bfnrt] | "u" [0-9a-f]{4}))* "\"";
-number:nows = "-"? ("0" | [1-9][0-9]*) ("." [0-9]+)? ([eE] [+\-]? [0-9]+)?;
-entry       = string ":" value;
-object      = "{" (entry ("," entry)*)? "}";
-array       = "[" (value ("," value)*)? "]";
+string      = "\"" ([^\\"\b\f\n\r\t] | "\\" (["\\/bfnrt] | "u" [0-9a-f]{4}))* "\"";
+number      = "-"? ("0" | [1-9][0-9]*) ("." [0-9]+)? ([eE] [+\-]? [0-9]+)?;
+entry       = string ws* ":" ws* value;
+object      = "{" ws* (entry ws* ("," ws* entry)*)? ws* "}";
+array       = "[" ws* (value ws* ("," ws* value)*)? ws* "]";
 value:alias = true | false | null | string | number | object | array;
 json:root   = value;
diff --git a/mml_test.go b/mml_test.go
index ac3cc16..db47e05 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 4473644..623327f 100644
--- a/sequence.go
+++ b/sequence.go
@@ -20,11 +20,12 @@ type sequenceParser struct {
 }
 
 type sequenceBuilder struct {
-	name   string
-	id     int
-	commit CommitType
-	items  []builder
-	ranges [][]int
+	name       string
+	id         int
+	commit     CommitType
+	items      []builder
+	ranges     [][]int
+	includedBy []int
 }
 
 func newSequence(name string, ct CommitType, items []SequenceItem) *sequenceDefinition {
@@ -87,6 +88,17 @@ func (d *sequenceDefinition) setIncludedBy(r *registry, includedBy int, parsers
 	}
 
 	d.includedBy = appendIfMissing(d.includedBy, includedBy)
+
+	if d.sbuilder == nil {
+		d.sbuilder = &sequenceBuilder{
+			name:   d.name,
+			id:     d.id,
+			commit: d.commit,
+		}
+	}
+
+	d.sbuilder.includedBy = appendIfMissing(d.sbuilder.includedBy, includedBy)
+
 	if !d.includeItems() {
 		return nil
 	}
@@ -227,6 +239,10 @@ func (b *sequenceBuilder) build(c *context) ([]*Node, bool) {
 		return nil, false
 	}
 
+	for _, ib := range b.includedBy {
+		c.store.takeMatchLength(c.offset, ib, to)
+	}
+
 	from := c.offset
 	var (
 		itemIndex    int
@@ -239,7 +255,7 @@ func (b *sequenceBuilder) build(c *context) ([]*Node, bool) {
 		n, ok := b.items[itemIndex].build(c)
 		if !ok {
 			if currentCount < b.ranges[itemIndex][0] {
-				panic("damaged parse result")
+				panic(b.name + ": damaged parse result")
 			}
 
 			itemIndex++
diff --git a/store.go b/store.go
index 9d53797..e40b539 100644
--- a/store.go
+++ b/store.go
@@ -75,6 +75,40 @@ func (s *store) takeMatch(offset, id int) (int, bool) {
 	return to, found
 }
 
+func (s *store) takeMatchLength(offset, id, to int) (int, bool) {
+	if s.hasNoMatch(offset, id) {
+		return 0, false
+	}
+
+	if len(s.match) <= offset {
+		return 0, false
+	}
+
+	var (
+		found bool
+		// index int
+	)
+
+	for i := 0; i < len(s.match[offset]); i += 2 {
+		if s.match[offset][i] != id {
+			continue
+		}
+
+		found = true
+		if s.match[offset][i+1] == to {
+			s.match[offset][i] = -1
+			return to, true
+			//eindex = i
+		}
+	}
+
+	if found {
+		// s.match[offset][index] = -1
+	}
+
+	return to, found
+}
+
 func (s *store) ensureOffset(offset int) {
 	if len(s.match) > offset {
 		return