Enter into

In which one does not need the preposition “into” seeing as, by definition, entering something — even a legal contract — is “going into it”.

Nonetheless, the resourceful draftsperson will insist on entering into legal agreements (and might correct your draft if you neglect to do so). Indeed, one with a higher dan might even chain his or her prepositions together, tether them to a passive and speak reverently of a transaction “entered into under this agreement”.