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Lulu's friends want to go for a tour by train. To make it start, there must be exactly one carriage for each goblin !

Click on the number of needed carriages or type in the number by using the keyboard.

If you have put too many or not enough carriages, the locomotive will start alone.
If you have put the right number of carriages, Lulu's friends leave for a tour.

The maximum number which is studied can be adjusted between 4 and 9 by using the - and + buttons.

Good luck !