56 of tab 48 are inserted into cavities 82 80 and 78 respectively to join first ramp member 20 first end 66 and second ramp member 22 second end 42 together a method for attaching two ramp members 20 22 together to form an inside corner will now be discussed and shown in fig1 and 10 a in this embodiment the predetermined angle between the longitudinal axes of ramp members 20 and 22 is also approximately 90 degrees again it is contemplated that the following description of cuts of the ramp members and corresponding portions can be done in a number of ways and order of cuts to obtain the desired result the following is merely one way of accomplishing the desired result referring to fig3 8 10 and 10 a to form an inside corner tab 48 is cut from first ramp member first end 66 first tab portion 50 is then separated from second tab portion 54 to form a connector a portion of first ramp member first end 66 is then cut off along groove 64 fig7 to form a mating edge 72 also a portion of second ramp member 22 second end 42 is cut off along.