You can use the "Per Project" type of agreement. That agreement template allows you to set the number of months you're working with a client (6 in this case) and then set up the number of installment payments you want (in this case 5), plus you can enter the exact dollar amount for each installment. Also, if you ever had a client that made a larger down payment and then paid 4 smaller payments, for example, the Per Project agreement type will accommodate that as well.
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