The phrase "were contracted" implies that something was formed, agreed upon, or shortened. Synonyms for this phrase could include "were formed," "were agreed upon," "were established," "were set up," "were solidified," "were reduced," or "were abbreviated." Each of these phrases carries a slightly different connotation, but all imply that some kind of change or agreement was implemented. For example, "were established" might suggest a more permanent change, while "were reduced" might suggest a shorter-term change in size or duration. Choosing the most appropriate synonym will depend on the context and intended meaning of the sentence.