help on this

[balavaka]

If a paragraph starts with <S1> and the next paragraph is starts with <S2> in the to change them to <S1-S2>.

(eg. <S1-S2>; <S2-S3>, <S3-S4>)

<S1>Some Text
<S2>Some Text

Change to:
<S1>Some Text
<S1-S2>Some Text