| http://www.w3.org/ns/prov#value | - The exchance possibilities are limited, and in general I do not know in advance at which moment I will be free (by the way, most subscriptions are not for a fixed day of the week).Besides, the prices are not especially interesting(for most subscriptions, it is the same price as what one would pay for seats taken separately).However, I admit that there have been some improvements in the subscription mode
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