What is the meaning of this code statement in verilog? - 


'define vend_a_drink {d,dispense,collect} = {idle, 2'b11}

d - next_state
dispense - dispense drink
collect - collect coins
given statement included in code written using verilog vending machine.

when `vend_a_drink present replaced {d,dispense,collect} = {idle, 2'b11} during pre-compilation.


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