 Indeed, the distributivity problem and the collapsing problem are two instances of the same phenomenon of emergence of unexpected interactions (such as bridge principles) between connectives caused by combination processes. In the case of combination of conjunction with disjunction, the distributive law emerges: this interaction is due to the combination process and appears without any apparent reason. In turn, the collapsing problem is a limit case of interactions: the interderivability between classical and intuitionistic implication (nothing else than two interaction laws between different connectives) is also spontaneously created by the combination process.