Stacked a kallax 2x4 & 3x4 on top of a 5x5. But now I'm having doubts. It's mounted to the (very old) brick wall, as shown in the picture. Do you think
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KALLAX Shelf unit, white stained oak effect, 112x147 cm (441/8x577/8") - IKEA CA
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KALLAX Shelving unit with underframe, white stained oak effect/white, 147x129 cm (577/8x503/4") - IKEA CA