FIG. 01 is top plan view of a first embodiment there of;
FIG. 02 is bottom plan view thereof;
FIG. 03 is a first side elevation view thereof;
FIG. 04 is a second side elevation view thereof;
FIG. 05 is a first end elevation view thereof;
FIG. 06 is a second end elevation view thereof;
FIG. 07 is an elevated perspective view thereof;
FIG. 08 is top plan view of a second embodiment without contrast there of;
FIG. 09 is bottom plan view thereof;
FIG. 10 is a first side elevation view thereof;
FIG. 11 is a second side elevation view thereof;
FIG. 12 is a first end elevation view thereof;
FIG. 13 is a second end elevation view thereof;
FIG. 14 is an elevated perspective view thereof;
FIG. 15 is top plan view of a third embodiment sloped on the bottom there of;
FIG. 16 is bottom plan view thereof;
FIG. 17 is a first side elevation view thereof;
FIG. 18 is a second side elevation view thereof;
FIG. 19 is a first end elevation view thereof;
FIG. 20 is a second end elevation view thereof;
FIG. 21 is an enlarged elevated perspective view thereof;
FIG. 22 is top plan view of a fourth embodiment without contrast there of;
FIG. 23 is bottom plan view thereof;
FIG. 24 is a first side elevation view thereof;
FIG. 25 is a second side elevation view thereof;
FIG. 26 is a first end elevation view thereof;
FIG. 27 is a second end elevation view thereof; and,
FIG. 28 is an enlarged elevated perspective view thereof.
The blocks in FIGS. 1-7 and 15-21 are shaded with diagonal lines to show a contrast in appearance relative to portions with no diagonal lines.