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| A | A | A | A | Stackable for storage | |  |  |  | |
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| A | Sections slide in either directions or slide
apart. Sections can be stored at one side or both sides. The
number of section is equal to the number of tracks. | | B & C | Sections slide in both directions from the center. Sections
can be stored at both sides. There are two sections per track
except for the middle section. Works only for an odd number
of sectioins. | | | |  | | |
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