Merge branch 'develop'
Merge https://github.com/oo7/Duo
write section16
write section17
writing section18
write section18
記述ミス修正(ina->in a)
write section19
write section20
repairer section20 and write section21
write section22 +Correction
Merge branch 'develop'
write section23
epub形式の表紙を追加
write section24 and Correction of section23
write section25
Correct the underline of title
write section26
Correction
write section27