5. Contact Form 7Contact Form 7 is a plug-in that allows you to create contact forms that make it easy for your users to send messages to your site. The plug-in was developed by Takayuki Miyoshi and lets you create multiple contact forms on the same site; it also integrates Akismet spam filtering and lets you customize the styling and fields that you want to use in the form. The plug-in provides CAPTCHA and Ajax submitting.
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1990年，通胀率飙升至约7650%。当时，街头的小贩每天都要重新标价，因为早上的价格到下午就已经作废；工人领到工资的第一件事，是冲进商店把钱花掉，因为放到第二天就会贬值。储蓄成了笑话，投资成了赌博。
This formula is satisfiable because if we set to b to true and a to false, then the whole formula is true. All other assignments make the formula false, but it doesn't change that the formula is satisfiable as long as there is at least one assignment makes the formula true.