It would be very useful if identical items were grouped.
For example if a table orders two burgers, then it is easy to repeat the order and it is printed on the ticket as 2 x burgers.
However, if one is taking orders from a big table and the orders are not next to each other then it will be printed as
burger
patatas
aubergine
burger
etc....
if the ticket is large then it wakes time and leads to more mistakes to count the number of items. This includes drinks at the bar.
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