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What is the meaning of 'L' in drawing?
Center line
Long break line
Outlines
Extension line
Center line
Fix the constraints with the fewest possibilities (the A-Z gap) first, then place the smaller blocks (C, X) and B, adjusting L and Y to fit the remaining slots.
Fix the constraints with the fewest possibilities (the A-Z gap) first, then place the smaller blocks (C, X) and B, adjusting L and Y to fit the remaining slots.
Define constraints
Let the positions be 1 (top) to 7 (bottom). 1) Four boxes between A and Z means (A=2, Z=7) or (A=1, Z=6) or (A=3, Z=8 - invalid). 2) Only B is above A means B is at 1 and A is at 2.
Placement
With B at 1 and A at 2, Z must be at 7 (4 boxes between 2 and 7 are 3, 4, 5, 6). Remaining slots: 3, 4, 5, 6 for C, X, L, Y.
Apply C and X constraint
C is immediately above X, so they occupy (3,4) or (5,6). If (3,4), L and Y must be (5,6), but Y cannot be immediately above C, which is satisfied here. If (5,6), L and Y would be (3,4) with 2 boxes between them, which is impossible. Thus, C=4 and X=5.
Final verification
Positions: 1-B, 2-L/Y, 3-A, 4-C, 5-X, 6-Y/L, 7-Z. C is indeed 4th from top.
B: Incorrect, B is at position 1. C: Incorrect, L/Y are at position 2 or 6. D: Incorrect, X is at position 5.
A is correct because the sequence B-L/Y-A-C-X-Y/L-Z places box C in the 4th position.
In stack puzzles, always prioritize placing items with absolute constraints (like 'only X above Y') to minimize scenarios.
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