diff --git a/jieba.go b/jieba.go
index fbc2e83..fe9b2cc 100644
--- a/jieba.go
+++ b/jieba.go
@@ -48,6 +48,41 @@ func (rs routes) Swap(i, j int) {
 	rs[i], rs[j] = rs[j], rs[i]
 }
 
+type Jieba struct {
+	Total float64
+	Freq  map[string]float64
+}
+
+func (j *Jieba) AddEntry(entry *Entry) {
+	j.Add(entry.Word, entry.Freq)
+}
+
+func (j *Jieba) Add(word string, freq float64) {
+	j.Freq[word] = freq
+	j.Total += freq
+	runes := []rune(word)
+	for i := 0; i < len(runes); i++ {
+		frag := string(runes[0 : i+1])
+		if _, ok := j.Freq[frag]; !ok {
+			j.Freq[frag] = 0.0
+		}
+	}
+}
+
+// Load user specified dictionary file.
+func (j *Jieba) LoadUserDict(dictFilePath string) error {
+	return LoadDict(j, dictFilePath, false)
+}
+
+// Set the dictionary, could be absolute path of dictionary file, or dictionary
+// name in current directory. This function must be called before cut any
+// sentence.
+func NewJieba(dictFileName string) (*Jieba, error) {
+	j := &Jieba{Total: 0.0, Freq: make(map[string]float64)}
+	err := SetDict(j, dictFileName, false)
+	return j, err
+}
+
 // Build a directed acyclic graph (DAG) for sentence.
 func (j *Jieba) DAG(sentence string) map[int][]int {
 	dag := make(map[int][]int)
diff --git a/trie.go b/trie.go
deleted file mode 100644
index 0477455..0000000
--- a/trie.go
+++ /dev/null
@@ -1,36 +0,0 @@
-package jiebago
-
-type Jieba struct {
-	Total float64
-	Freq  map[string]float64
-}
-
-func (j *Jieba) AddEntry(entry *Entry) {
-	j.Add(entry.Word, entry.Freq)
-}
-
-func (j *Jieba) Add(word string, freq float64) {
-	j.Freq[word] = freq
-	j.Total += freq
-	runes := []rune(word)
-	for i := 0; i < len(runes); i++ {
-		frag := string(runes[0 : i+1])
-		if _, ok := j.Freq[frag]; !ok {
-			j.Freq[frag] = 0.0
-		}
-	}
-}
-
-// Load user specified dictionary file.
-func (j *Jieba) LoadUserDict(dictFilePath string) error {
-	return LoadDict(j, dictFilePath, false)
-}
-
-// Set the dictionary, could be absolute path of dictionary file, or dictionary
-// name in current directory. This function must be called before cut any
-// sentence.
-func NewJieba(dictFileName string) (*Jieba, error) {
-	j := &Jieba{Total: 0.0, Freq: make(map[string]float64)}
-	err := SetDict(j, dictFileName, false)
-	return j, err
-}