Techniques allow automatic identification of statistically significant attribute combinations in a dataset, and provide users with an understanding thereof including starting points for further analysis. The set of differential signal wires includes a plurality of signal wires, and each of the signal wires has an insulator and a conductor. The depth of the concave grooves increases toward the center of the light guide, and the angle formed between two inclined faces that constitute each groove is within the range of 105\xb0 to 115\xb0. The sensing device also generates movement data indicative of the sensing device’s movement relative to the interface surface. In a roll forming process, a rack is provided for receiving and transporting the roll forming apparatus over the container. The door includes two side beams, a top beam and a bottom beam, each having a surface within a common plane for sealing with the respective sealing surface in the common vertical sealing plane of the opening.