The obligation of motivation of the praise, the which is missing fulfillment determines the possibilities of challenge it per nullity, to the senses of art. 829, n. 5, cod. Proc. Civ., Can be considered dissatisfied only when the motivation to all or is . te lack from not allow understand the logical process which has determined the decision arbitration, or contain contradictions inconclusive in the body of the motivation or of the device such to make incomprehensible the ratio of the decision.