12 ANTHONY V. PHILLIPS and DAVID A. STONE
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Figure 1.3: Some geometric bar-products and their boundaries, (a)
X0[Xi] : dimXo = 0, dimXa = 1. (b) X0[*i] : dimX0 = 1, dimXj =
1. (c) Xof^lXa] : dimXo = 0, dimXa = 1, dimX2 = 0. (d)
X0[Xi\X2] : dimXo = 1, dimXi = 0, dimX2 = 0.
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