need help!!!!!

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i am going to france tomrrow, and i need to change trains in paris...... i am fine with the stations and everything else...... But..... when i get my ticket.... what do i need to ask for (im 18 yrs old).... (in french would be great)...????? i have looked at many places, and some say get a book of tickets, or a pass...... i have been before to caen, and just trying to find what ticket i needed there....... there was a very long queue. any help is majorly appreciated!