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A Coffee Machine Question

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transgalactic

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there is a coffee machine
the cost of a coffee is 1.5 dollars
we cant put a coin of 1 dollar and a half dollar together
x0=1 says that half of a dollar was inputed
x1=1 says that 1 dollar inputed

z0=1 the machine should output coffee
z1=1 the machine should output change

i have solved it till some point
but then i got confused regarding how to build an output table for this function
plus there are two input situations
i dont know how many variables to write in the karno tables

my main concern is the output table

https://img204.imageshack.us/my.php?image=img86901ri0.jpg

thanks
 

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