The action+per+the assessment+of the+nature+usury+of the+interests+due+in+base+a+a+contract+of+leasing,+with+the+consequent+condemnation+of the+counterpart+to the+return+of+what+unduly+perceived+a+such a title,+is+susceptible+of+referring+decision+of the referees,+in+it is+a+an object+ Ritto+Available,+without+the+the+deduced+nullity+of the+contract+place+a+base+of the+question,+which concerns,+instead,+the+merit+of the+claim,+is+a+a+to exclude+the+competence+arbitration,+being+illogical+to depend+the operation+of the+convention+of+arbitration+from the+merit+of the+dispute.