Law 9 (The bowling, popping and return creases)
                  1. The creases
                  A bowling crease, a popping crease and two return creases shall 
                  be marked in white, as set out in 2, 3 and 4 below, at each 
                  end of the pitch. See Appendix B.
                  2. The bowling crease
                    The bowling crease, which is the back edge of the crease marking, 
                    shall be the line through the centres of the three stumps 
                    at that end. It shall be 8ft 8 in/2.64m in length, with the 
                    stumps in the centre.
                  3. The popping crease
                    The popping crease, which is the back edge of the crease marking, 
                    shall be in front of and parallel to the bowling crease and 
                    shall be 4ft/1.22m from it. The popping crease shall be marked 
                    to a minimum of 6ft/1.83m on either side of the imaginary 
                    line joining the centres of the middle stumps and shall be 
                    considered to be unlimited in length.
                  4. The return creases
                    The return creases, which are the inside edges of the crease 
                    markings, shall be at right angles to the popping crease at 
                    a distance of 4ft 4 in/1.32m either side of the imaginary 
                    line joining the centres of the two middle stumps. Each return 
                    crease shall be marked from the popping crease to a minimum 
                    of 8ft/2.44m behind it and shall be considered to be unlimited 
                    in length.