I have a whatsapp conversation consisting of two categories of words:

bla bla bla bla
 <indig>fu fu</indig>
 <indig>fu fu</indig>
 bla bla bla bla bla bla.. bla bla bla bla bla
 <indig>fu</indig>?
 <indig>fu fu</indig>?
 bla bla bla bla bla bla bla bla bla bla bla bla
 bla
 <indig>fu fu</indig>
 bla bla <indig>fu</indig>
 bla <indig>fu</indig>
 bla.. bla
 bla bla bla bla bla bla ??
 bla bla bla
 bla bla bla bla bla bla bla
 bla bla bla bla bla bla bla bla bla
 bla bla <indig>fu</indig> bla