a case study: you are an owner of a bikestore. One day your employee, who doesn't speak English very well accepted a bicycle to fix from a non-Dutch customer. There was a flat tire on one wheel, and also the wheel is totally broken. Your service:
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a. contact customer (you have his/her mobile phone#) to make sure he/she wants to have functioning bicycle, which means changing the whole wheel.
b. you change a tube in a broken wheel, so now the tire is fixed in a bicycle the customer can’t ride anyway. It's just good to have a fixed tire in a broken bicycle.