Codeforces Beta Round 69 (Div. 1 Only)
D
Domino Carpet
Codeforces
2300
原题
← CE →
翻译中…

...Mike the TV greets you again!

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Tired of the monotonous furniture? Sick of gray routine? Dreaming about dizzying changes in your humble abode? We have something to offer you!

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This domino carpet for only $99.99 will change your life! You can lay it on the floor, hang it on the wall or even on the ceiling! Among other things ...

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Having watched the commercial, virus Hexadecimal also wanted to get a Domino Carpet and wanted badly to be photographed in front of it. But of course, a virus will never consent to buying a licensed Carpet! So she ordered a truck of dominoes and decided to make such a Carpet herself.

翻译中…

The original Domino Carpet is a field of squares $*n* × *m*$ in size. Each square is half of a domino, and can be rotated either vertically or horizontally, independently from its neighbors. Vertically rotated domino halves look like this:

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image

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And horizontally rotated halves look like this:

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image

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Notice, that some halves looks the same in both rotations, but other halves differ.

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Dominoes bought by Hexadecimal are represented by uncuttable chips $1 × 2$ in size, which can be laid either vertically or horizontally. If the chip is laid vertically, then both of it's halves should be laid vertically orientated; if the chip is laid horizontally, then both of it's halves should be laid horizontally.

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The samples of valid and invalid dominoes laid vertically and horizontally are:

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image

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Virus Hexadecimal assembles her own Domino Carpet so that the following conditions are satisfied:

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  • each carpet square is covered by a domino chip, i.e. there are no empty squares;
  • all domino chips lie entirely within the carpet and don't overlap with each other;
  • if there is a horizontal domino chip with its left half in column $*j*$ then there are no horizontal domino chips with their left halves in columns $*j* - 1$ or $*j* + 1$.
翻译中…

Before starting to assemble her own Domino Carpet, the virus wants to know the number of ways to achieve the intended purpose modulo $10^{9} + 7$.

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You can assume that the virus has an infinitely large number of dominoes of each type.

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Input

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The first line contains two integers $*n*$ and $*m*$, separated by a space — the size of the Domino Carpet ($1 ≤ *n*, *m* ≤ 250$). Next $4*n* + 1$ lines contain $4*m* + 1$ symbols.

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Each square of the Domino Carpet, which is a domino half, is described by a $3 × 3$ square. Symbol 'O' in this square indicates the presence of a point, symbol '.' — its absence.

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Each $3 × 3$ square is delineated from adjacent squares by symbols '#' as shown in the examples.

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It is guaranteed that every box describes the correct half of a domino.

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In all pretests the Domino Carpets have the size of $2 × 2$ and $4 × 4$.

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Output

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Print a single number, the number of ways to assemble the Domino Carpet modulo $10^{9} + 7$, using only standard dominoes of size $1 × 2$.

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Note

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A note to the first example: all correct ways to make Domino Carpet are represented below:

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image

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And this way is incorrect:

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image

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样例

Input #1
3 4
#################
#O..#...#O.O#...#
#.O.#.O.#.O.#...#
#..O#...#O.O#...#
#################
#O.O#OOO#O.O#...#
#.O.#...#...#.O.#
#O.O#OOO#O.O#...#
#################
#O.O#...#O.O#...#
#...#...#...#.O.#
#O.O#...#O.O#...#
#################
Output #1
3
InputCopy OutputCopy
Input #2
2 2
#########
#O.O#O.O#
#.O.#...#
#O.O#O.O#
#########
#...#O.O#
#...#...#
#...#O.O#
#########
Output #2
2
InputCopy OutputCopy
Input #3
2 2
#########
#..O#O..#
#...#...#
#O..#..O#
#########
#O..#..O#
#...#...#
#..O#O..#
#########
Output #3
0
InputCopy OutputCopy
题目信息
题号
77D
时间限制
2 s
内存限制
256 MB
标签
动态规划
模拟

题面与样例版权归 Codeforces 及出题人所有;中文翻译由 AI 生成(CI 管线),如有出入请以原文为准。