tree diagram - student's timetable

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Im having trouble drawing a tree for this question. I get 24 outcomes, but its only suppose to be 18.

A grade 9 student may build a timetable by selecting one course for each period, with no duplication of courses. Period 1 must be science, geo, or physical edu. Period 2 must be art, music , French, or business. Period 3 and 4 must be mathematics or English.
Construct a tree diagram to illustrate the choices for a student's timetable.

Here's what I did.
timetabletree.jpg

Thanks
 
Hello, Anna!

You did great!

Of course, that last row of lines should all be vertical lines, right?

 
yep, vertical lines

but the answer is suppose to be 18 =/ or maybe its wrong..I dunno
 
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