A contract is a legally binding agreement between parties whereby services are provided to a relation in exchange for reoccurring payments. For example:
a) Magazine subscriptions.
b) Support contracts.
c) Software services.
d) Club contributions (e.g. sport, rotary).
e) Music and book club membership.
f) Hosting contracts and services.
g) Phone subscriptions.
h) Management of rentals (renters).
i) Security companies.
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