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n=4的一些解
..1..2..3..4..8....1..5..6..4..8....1..2..3..4..8....1..2..3..4..8
..6..7..0..9.13....0..7..2..3.13....6..7..0.12.13....6.10..0..9.13
.11.12..5.17.18...11.12.16.14..9...11.15..5.17..9....5.15..7.17.18
.10.20.21.22.14...10.20.18.22.23...10.20.18.22.14...16.11.12.19.14
.15.16.23.24.19...15.25.17.24.19...21.16.23.27.19...21.22.23.27.28
.26.27.28.32.33...26.27.28.21.33...26.30.28.29.24...26.30.20.32.24
.25.35.36.37.29...31.35.36.34.29...25.35.33.37.38...25.35.33.37.29
.30.31.38.39.34...30.37.38.39.32...36.31.32.39.34...36.31.38.39.34
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