Thanks for writing. Yes, you can enter more than one submission.
Per the Official Rules:
"(iv) A Contestant may submit more than one Submission. However, each Submission must be unique, as determined by Sponsor in their sole discretion. If a Contestant enters two or more Submissions that are substantially similar, the Sponsor reserves the right to disqualify Submissions or require the Contestant to choose one Submission to enter into the Competition."