These stuffed mushrooms use fresh ingredients and definitely rival any version that you can find in the frozen foods section of the grocery store. (staysnatched.com)
But in his Three Rival Versions of Moral Enquiry (1990)-- where he notes that a university represents a «universe» of discourse only where rival and antagonistic views are afforded the opportunity both to develop their own positions and to debate other viewpoints — he implies that his quasi-Benedictine community will be one of civil conversation across the barricades. (firstthings.com)
Today's molecular anthropologists want to use genetic data to create an evolutionary tree of human populations, and various rival versions have already been produced. (newscientist.com)