How to enter invitation code in AIR MATH app?

so here's airmass app so to enter invitation code just tap on your profile in the bottom left tap invitation code and then you can just enter your invitation code and then the person who gave you the code they will earn three tickets so i just tap here on the blue tab and then i can just type in white friends and this is my invitation code which you can use so pmcl9i just copy that code and use in the invitation box i just showed you and then i will earn three tickets and that's also you can use a piece of friends and i will earn three tickets or anything like that

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