(Example code for implementing this below.)
Your goal is to construct another term (a "key") and apply it in such a way that, after full beta-reduction, only the coin remains.
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office did yet another round of arithmetic to produce the bank's overall，详情可参考体育直播
南方周末：金融机构的配合度高吗？
Крупнейшая нефтяная компания мира задумалась об альтернативе для морских перевозок нефти14:56