diff --git a/data/data.go b/data/data.go
index cb5516f..934fd1c 100644
--- a/data/data.go
+++ b/data/data.go
@@ -1,67 +1,5 @@
 package data
 
-import "fmt"
-
-// RelativeFrequency appearance frequency to character
-//
-// map[int][][][]int{
-//    (key - char code): {
-//        { (0 - hi score), (1 - hi score), (2 - hi score), (3 - hi score) }
-//    } {
-//      { (0 - score), (1 - score), (2 - score), (3 - score), (4 - char code) },
-//      { (0 - score), (1 - score), (2 - score), (3 - score), (4 - char code) },
-//      { (0 - score), (1 - score), (2 - score), (3 - score), (4 - char code) },
-//      ...
-//    }
-// }
-//
-// score:
-//  0: Frequency of the second character from the beginning
-//  1: Frequency of occurrence when the two previous character is a vowel
-//  2: Frequency of occurrence when the two previous character is a consonant
-//  3: Occurrence frequency of last character
-//
-// char code:
-//  range 97 to 122
-//
-type RelativeFrequency map[int][][][]int
-
-func isAlphaLower(n int) bool {
-	return n >= 97 && n <= 122
-}
-
-// IsValidData validation RelativeFrequency type data
-func IsValidData(m RelativeFrequency) error {
-	for k, v := range m {
-		if !isAlphaLower(k) {
-			return fmt.Errorf("%d is must be in the range of 97 to 122", k)
-		}
-		score := v[0][0]
-
-		if len(score) < 4 {
-			return fmt.Errorf("%d-0-0: slice must be 4 length or more %v", k, score)
-		}
-
-		for i, vvv := range v[1] {
-			if len(vvv) < 5 {
-				return fmt.Errorf("%d-1-%d: length must be 2 or more", k, i)
-			}
-			for j, s := range score {
-				if vvv[j] > s {
-					return fmt.Errorf("%d-1-%d: should not be higher than the high score: %d > %d", k, i, vvv[j], s)
-				}
-			}
-			charcode := vvv[4]
-			if !isAlphaLower(charcode) {
-				return fmt.Errorf("%d-1-%d: %d is must be in the range of 97 to 122", charcode, k, i)
-			}
-		}
-	}
-
-	return nil
-}
-
-// Data data
 var Data RelativeFrequency = map[int][][][]int{
 	97: {
 		{
diff --git a/data/generator.go b/data/generator.go
new file mode 100644
index 0000000..fa8744e
--- /dev/null
+++ b/data/generator.go
@@ -0,0 +1,191 @@
+package data
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"sort"
+	"strings"
+)
+
+// RelativeFrequency appearance frequency to character
+//
+// map[int][][][]int{
+//    (key - char code): {
+//        { (0 - hi score), (1 - hi score), (2 - hi score), (3 - hi score) }
+//    } {
+//      { (0 - score), (1 - score), (2 - score), (3 - score), (4 - char code) },
+//      { (0 - score), (1 - score), (2 - score), (3 - score), (4 - char code) },
+//      { (0 - score), (1 - score), (2 - score), (3 - score), (4 - char code) },
+//      ...
+//    }
+// }
+//
+// score:
+//  0: Frequency of the second character from the beginning
+//  1: Frequency of occurrence when the two previous character is a vowel
+//  2: Frequency of occurrence when the two previous character is a consonant
+//  3: Occurrence frequency of last character
+//
+// char code:
+//  range 97 to 122
+//
+type RelativeFrequency map[int][][][]int
+
+// IsValidData validation RelativeFrequency type data
+func IsValidData(m RelativeFrequency) error {
+	for k, v := range m {
+		if k < 97 || k > 122 {
+			return fmt.Errorf("%d is must be in the range of 97 to 122", k)
+		}
+		score := v[0][0]
+
+		if len(score) < 4 {
+			return fmt.Errorf("%d-0-0: slice must be 4 length or more %v", k, score)
+		}
+
+		for i, vvv := range v[1] {
+			if len(vvv) < 5 {
+				return fmt.Errorf("%d-1-%d: length must be 2 or more", k, i)
+			}
+			for j, s := range score {
+				if vvv[j] > s {
+					return fmt.Errorf("%d-1-%d: should not be higher than the high score: %d > %d", k, i, vvv[j], s)
+				}
+			}
+			charcode := vvv[4]
+			if charcode < 97 || charcode > 122 {
+				return fmt.Errorf("%d-1-%d: %d is must be in the range of 97 to 122", charcode, k, i)
+			}
+		}
+	}
+
+	return nil
+}
+
+type intslice [][]int
+
+func (a intslice) Len() int {
+	return len(a)
+}
+
+func (a intslice) Swap(i, j int) {
+	a[i], a[j] = a[j], a[i]
+}
+
+func (a intslice) Less(i, j int) bool {
+	return a[i][4] > a[j][4]
+}
+
+func isvowel(n byte) bool {
+	switch n {
+	case 97, 101, 105, 111, 117:
+		return true
+	}
+	return false
+}
+
+// Write
+func Write(w io.Writer, m *RelativeFrequency) {
+	key := make([]int, len(*m))
+	i := 0
+	for k := range *m {
+		key[i] = k
+		i++
+	}
+	sort.Ints(key)
+
+	fmt.Fprint(w, "{\n")
+	for _, k := range key {
+		fmt.Fprintf(w, "\t%d: {\n\t\t{\n", k)
+		v := (map[int][][][]int(*m))[k]
+		for _, vv := range v[0] {
+			format := "\t\t\t{%d, %d, %d, %d},\n"
+			fmt.Fprintf(w, format, vv[0], vv[1], vv[2], vv[3])
+		}
+		v1 := intslice(v[1])
+		sort.Sort(v1)
+		for i, vv := range v1 {
+			var format string
+			switch i {
+			case 0:
+				format = "\t\t},\n\t\t{\n\t\t\t{%d, %d, %d, %d, %d},\n"
+			case len(v[1]) - 1:
+				format = "\t\t\t{%d, %d, %d, %d, %d},\n\t\t},\n\t},\n"
+			default:
+				format = "\t\t\t{%d, %d, %d, %d, %d},\n"
+			}
+			fmt.Fprintf(w, format, vv[0], vv[1], vv[2], vv[3], vv[4])
+		}
+	}
+	fmt.Fprint(w, "}\n")
+}
+
+// Generate
+func Generate(a []string) (RelativeFrequency, error) {
+	mm := map[byte]map[byte][]int{}
+	for _, v := range a {
+		v = strings.ToLower(v)
+		for i := 1; i < len(v); i++ {
+			if v[i-1] < 97 || v[i-1] > 122 ||
+				v[i] < 97 || v[i] > 122 {
+				return nil, errors.New("out of range 97 to 122")
+			}
+
+			k1, k2 := byte(v[i-1]), byte(v[i])
+			_, ok := mm[k1]
+			if !ok {
+				mm[k1] = map[byte][]int{
+					k2: []int{0, 0, 0, 0},
+				}
+			} else if _, ok = mm[k1][k2]; !ok {
+				mm[k1][k2] = []int{0, 0, 0, 0}
+			}
+
+			if i == 1 {
+				mm[k1][k2][0]++
+
+			} else if len(v)-1 == i {
+				mm[k1][k2][3]++
+
+			} else if i-2 >= 0 {
+				if isvowel(v[i-2]) {
+					mm[k1][k2][1]++
+				} else {
+					mm[k1][k2][2]++
+				}
+			}
+		}
+	}
+
+	m := map[int][][][]int{}
+	for k, v := range mm {
+		k1 := int(k)
+		_, ok := m[k1]
+		if !ok {
+			m[k1] = [][][]int{
+				{{0, 0, 0, 0}}, {},
+			}
+		}
+
+		for kk, vv := range v {
+			k2 := int(kk)
+			if vv[0] > m[k1][0][0][0] {
+				m[k1][0][0][0] = vv[0]
+			}
+			if vv[1] > m[k1][0][0][1] {
+				m[k1][0][0][1] = vv[1]
+			}
+			if vv[2] > m[k1][0][0][2] {
+				m[k1][0][0][2] = vv[2]
+			}
+			if vv[3] > m[k1][0][0][3] {
+				m[k1][0][0][3] = vv[3]
+			}
+
+			m[k1][1] = append(m[k1][1], append(vv, k2))
+		}
+	}
+
+	return m, nil
+}
diff --git a/data/generator_test.go b/data/generator_test.go
new file mode 100644
index 0000000..2595951
--- /dev/null
+++ b/data/generator_test.go
@@ -0,0 +1,96 @@
+package data
+
+import (
+	"bufio"
+	"bytes"
+	"reflect"
+	"strings"
+	"testing"
+)
+
+func TestGenerate(t *testing.T) {
+	data := []string{
+		"foo",
+		"bar",
+		"baz",
+	}
+
+	actual, err := Generate(data)
+	if err != nil {
+		t.Errorf("\nshould be not an error: %v\n", err)
+	}
+
+	expect := RelativeFrequency{
+		97:  {{{0, 0, 0, 1}}, {{0, 0, 0, 1, 114}, {0, 0, 0, 1, 122}}},
+		98:  {{{2, 0, 0, 0}}, {{2, 0, 0, 0, 97}}},
+		102: {{{1, 0, 0, 0}}, {{1, 0, 0, 0, 111}}},
+		111: {{{0, 0, 0, 1}}, {{0, 0, 0, 1, 111}}},
+	}
+
+	if !reflect.DeepEqual(actual, expect) {
+		t.Errorf("\ngot : %v\nwant: %v\n", actual, expect)
+	}
+}
+
+func TestWrite(t *testing.T) {
+	data := RelativeFrequency{
+		97:  {{{0, 0, 0, 1}}, {{0, 0, 0, 1, 114}, {0, 0, 0, 1, 122}}},
+		98:  {{{2, 0, 0, 0}}, {{2, 0, 0, 0, 97}}},
+		102: {{{1, 0, 0, 0}}, {{1, 0, 0, 0, 111}}},
+		111: {{{0, 0, 0, 1}}, {{0, 0, 0, 1, 111}}},
+	}
+
+	expect := `{
+	97: {
+		{
+			{0, 0, 0, 1},
+		},
+		{
+			{0, 0, 0, 1, 122},
+			{0, 0, 0, 1, 114},
+		},
+	},
+	98: {
+		{
+			{2, 0, 0, 0},
+		},
+		{
+			{2, 0, 0, 0, 97},
+	102: {
+		{
+			{1, 0, 0, 0},
+		},
+		{
+			{1, 0, 0, 0, 111},
+	111: {
+		{
+			{0, 0, 0, 1},
+		},
+		{
+			{0, 0, 0, 1, 111},
+}
+`
+
+	var buff bytes.Buffer
+	Write(&buff, &data)
+
+	actual := buff.String()
+	if actual != expect {
+
+		e := bufio.NewScanner(strings.NewReader(expect))
+		a := bufio.NewScanner(strings.NewReader(actual))
+
+		for i := 0; e.Scan() && a.Scan(); i++ {
+			if strings.Compare(e.Text(), a.Text()) != 0 {
+				t.Errorf("\nline: %d:\n%v\n%v\n", i, e.Text(), a.Text())
+				return
+			}
+		}
+		if err := a.Err(); err != nil {
+			t.Errorf("\nerror actual-scanner: %v\n", err)
+		}
+		if err := e.Err(); err != nil {
+			t.Errorf("\nerror expect-scanner: %v\n", err)
+		}
+	}
+}