diff --git a/char.go b/char.go
index 2a4099a..3bb0ae6 100644
--- a/char.go
+++ b/char.go
@@ -83,6 +83,6 @@ func (p *charParser) parse(t Trace, c *context) {
 
 	c.success(c.offset + 1)
 	for _, includedBy := range p.includedBy {
-		includedBy.storeIncluded(c, c.offset, c.offset + 1)
+		includedBy.storeIncluded(c, c.offset, c.offset+1)
 	}
 }
diff --git a/choice.go b/choice.go
index c0f3d2a..55df20b 100644
--- a/choice.go
+++ b/choice.go
@@ -117,15 +117,17 @@ func (p *choiceParser) parse(t Trace, c *context) {
 	to := c.offset
 
 	var match bool
+	var nextTo int
+	var elementIndex int
 
 	for {
-		elementIndex := 0
 		var foundMatch bool
+		elementIndex = 0
 
 		for elementIndex < len(p.elements) {
 			p.elements[elementIndex].parse(t, c)
 			elementIndex++
-			nextTo := c.offset
+			nextTo = c.offset
 			c.offset = from
 
 			if !c.match || match && nextTo <= to {
diff --git a/context.go b/context.go
index 137f9c8..150e7e7 100644
--- a/context.go
+++ b/context.go
@@ -15,7 +15,7 @@ type context struct {
 	tokens     []rune
 	match      bool
 	node       *Node
-	isExcluded []*idSet
+	isExcluded [][]int
 }
 
 func newContext(r io.RuneReader) *context {
@@ -65,43 +65,41 @@ func (c *context) token() (rune, bool) {
 }
 
 func (c *context) excluded(offset int, id int) bool {
-	if len(c.isExcluded) <= offset || c.isExcluded[offset] == nil {
+	if len(c.isExcluded) <= id {
 		return false
 	}
 
-	return c.isExcluded[offset].has(id)
-}
-
-func (c *context) exclude(offset int, id int) {
-	if c.excluded(offset, id) {
-		return
-	}
-
-	if len(c.isExcluded) <= offset {
-		c.isExcluded = append(c.isExcluded, nil)
-		if cap(c.isExcluded) > offset {
-			c.isExcluded = c.isExcluded[:offset+1]
-		} else {
-			c.isExcluded = append(
-				c.isExcluded[:cap(c.isExcluded)],
-				make([]*idSet, offset+1-cap(c.isExcluded))...,
-			)
+	for i := range c.isExcluded[id] {
+		if c.isExcluded[id][i] == offset {
+			return true
 		}
 	}
 
-	if c.isExcluded[offset] == nil {
-		c.isExcluded[offset] = &idSet{}
+	return false
+}
+
+func (c *context) exclude(offset int, id int) {
+	if len(c.isExcluded) <= id {
+		if cap(c.isExcluded) > id {
+			c.isExcluded = c.isExcluded[:id+1]
+		} else {
+			c.isExcluded = c.isExcluded[:cap(c.isExcluded)]
+			for i := cap(c.isExcluded); i <= id; i++ {
+				c.isExcluded = append(c.isExcluded, nil)
+			}
+		}
 	}
 
-	c.isExcluded[offset].set(id)
+	c.isExcluded[id] = append(c.isExcluded[id], offset)
 }
 
 func (c *context) include(offset int, id int) {
-	if len(c.isExcluded) <= offset || c.isExcluded[offset] == nil {
-		return
+	for i := range c.isExcluded[id] {
+		if c.isExcluded[id][i] == offset {
+			c.isExcluded[id] = append(c.isExcluded[id][:i], c.isExcluded[id][i+1:]...)
+			break
+		}
 	}
-
-	c.isExcluded[offset].unset(id)
 }
 
 func (c *context) fromStore(id int) (bool, bool) {
diff --git a/sequence.go b/sequence.go
index 9f179c2..eecaa1d 100644
--- a/sequence.go
+++ b/sequence.go
@@ -129,9 +129,9 @@ func (p *sequenceParser) parse(t Trace, c *context) {
 		return
 	}
 
-	if c.store.hasNoMatch(c.offset, p.id) {
-		c.fail(c.offset)
-	}
+	// if c.store.hasNoMatch(c.offset, p.id) {
+	// 	c.fail(c.offset)
+	// }
 
 	c.exclude(c.offset, p.id)
 
@@ -144,7 +144,7 @@ func (p *sequenceParser) parse(t Trace, c *context) {
 		p.items[itemIndex].parse(t, c)
 		if !c.match {
 			if currentCount < p.ranges[itemIndex][0] {
-				c.store.setNoMatch(from, p.id)
+				// c.store.setNoMatch(from, p.id)
 				c.fail(from)
 				c.include(from, p.id)
 				return
diff --git a/store.go b/store.go
index 36a7458..cd0e3e0 100644
--- a/store.go
+++ b/store.go
@@ -2,7 +2,7 @@ package treerack
 
 type store struct {
 	noMatch []*idSet
-	match [][]int
+	match   [][]int
 }
 
 func (s *store) hasNoMatch(offset, id int) bool {
@@ -23,7 +23,7 @@ func (s *store) getMatch(offset, id int) (int, bool, bool) {
 	}
 
 	var (
-		found bool
+		found  bool
 		length int
 	)
 
@@ -33,8 +33,8 @@ func (s *store) getMatch(offset, id int) (int, bool, bool) {
 		}
 
 		found = true
-		if s.match[offset][i + 1] > length {
-			length = s.match[offset][i + 1]
+		if s.match[offset][i+1] > length {
+			length = s.match[offset][i+1]
 		}
 	}
 
@@ -52,7 +52,7 @@ func (s *store) ensureOffset(offset int) {
 	}
 
 	s.match = s.match[:cap(s.match)]
-	for i := len(s.match); i <= offset; i++ {
+	for i := cap(s.match); i <= offset; i++ {
 		s.match = append(s.match, nil)
 	}
 }
@@ -65,10 +65,10 @@ func (s *store) setMatch(offset, id, to int) {
 func (s *store) setNoMatch(offset, id int) {
 	if len(s.noMatch) <= offset {
 		if cap(s.noMatch) > offset {
-			s.noMatch = s.noMatch[:offset + 1]
+			s.noMatch = s.noMatch[:offset+1]
 		} else {
 			s.noMatch = s.noMatch[:cap(s.noMatch)]
-			for i := len(s.noMatch); i <= offset; i++ {
+			for i := cap(s.noMatch); i <= offset; i++ {
 				s.noMatch = append(s.noMatch, nil)
 			}
 		}