The color(s) green, orange, white, blue, and gray is/are claimed as a feature of the mark. The mark consists of a gray rectangle within which are a green circle, an orange circle, and a blue circle partially overlapping each other, each outlined in white, with a white letter "C" inside of the green circle, a white letter "h" inside of the orange circle, and a white number "4" inside of the blue circle. There is a black plus sign partially overlapping the blue circle and another black plus sign to the upper right of the blue circle.