this is mine ```fun Shop.getCustomersWithMoreUndel...
# getting-startede
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09/28/2016, 6:55 PMthis is mine
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fun Shop.getCustomersWithMoreUndeliveredOrdersThanDelivered(): Set<Customer> =
customers.partition { it.orders.filter { it.isDelivered == false }.count() > it.orders.filter { it.isDelivered == true }.count() }.first.toSet()