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1. A finishing accessory comprising a deformable finishing profile and at least one blocking part, said deformable finishing profile is suitable for making up a finishing transition between two surfaces, and comprises two rigid wings that extend lengthwise parallel to a longitudinal axis A, which are spaced from one another and which are intended to be in contact respectively with the two surfaces to be connected, and a flexible hinge that extends lengthwise parallel to said longitudinal axis A, which is, at least in part, positioned between the two rigid wings, and which connects the two rigid wings to one another, each rigid win has, on a lower face of each rigid wing, a rigid longitudinal projection that extends lengthwise parallel to said longitudinal axis A, the flexible hinge and the two rigid longitudinal projections define a longitudinal groove between the two rigid longitudinal projections, the flexible hinge allowing a rotation of each rigid wing and respective rigid longitudinal projection relative to the other rigid wing and other respective rigid longitudinal projection in a plane (X, Y) perpendicular to the longitudinal axis A, said at least one blocking part comprises an adjusting shim, which extends lengthwise, which is capable of being inserted into said longitudinal groove and which, once inserted into said longitudinal groove, acts as a stop preventing the two rigid longitudinal projections from being brought closer to one another so as to block an inward rotation of the two rigid wings in relation to one another in a plane (X, Y) perpendicular to the longitudinal axis A and in a first direction of rotation of the of rotation of lower faces of the two rigid wings towards one another, with a predefined angular orientation of the two rigid wings relative to one another.
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