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1. A sensor mat for a surface sensor system, comprising a flexible base unit having: a first carrier element, which has a flat extension with a first base side and a second base side, a group of at least two sensor elements for detecting an event, a second carrier element comprising a first and a second base side, and an intermediate element arranged between the first carrier element and the second carrier element, and a plurality of electrical connectors arranged in edge regions of the flexible base unit to connect the sensor mat to at least one of an energy source, a control unit and another sensor mat; wherein the group of the at least two sensor elements are arranged on the second base side of the first carrier element in such a way that the base unit can be laid flat for a design of the surface sensor system, wherein each member of the at least two sensor elements having a detection area and the group of the at least two sensor elements is connected to at least one decentralized evaluation unit for processing sensor data of the group of the at least two sensor elements, which evaluation unit has a processor and is connectable to a central control unit, wherein the at least one decentralized evaluation unit extends at least partially into a receiving opening of the intermediate element; wherein a plurality of connection sections are extended in a cross-like manner to provide at least one electrical connection between the at least one decentralized evaluation unit and the plurality of electrical connectors; wherein each member of the group of the at least two sensor elements is connected to a respective one of the at least one decentralized evaluation unit, or the at least one decentralized evaluation unit is connected to each member of the group of the at least two sensor elements of the sensor mat.
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