小牛的孩子生日快要到了，他打算给孩子买蛋糕和小礼物，蛋糕和小礼物各买一个，他的预算不超过xxx元。蛋糕cakecakecake和小礼物giftgiftgift都有多种价位的可供选择。 请返回小牛共有多少种购买方案.
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