1031 Identification question

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I know there are a lot of 1031 experts on here so appreciate you reading the post.  I tried to do some searching and could not find this.  The identification period begins when the property is sold.  Say you have prospective properties under contract while the property you are selling is under contract.  Can you identify the prospective properties you have under contract as the replacements so long as you close on them after the sale of the property you are exchanging out of?