使用 * 画网格线，用 . 填充网格内部。网格有 $l$ 行、$c$ 列小方格，每个小方格内部固定为 $2\times2$ 个点，因此相邻横线和竖线之间都有两个 .。

输入格式

第一行包含整数 $t$，表示测试数据组数。接下来 $t$ 行给出各组数据。每组一行两个正整数 $l,c$，表示小方格的行数和列数。

输出格式

依次输出每组数据对应的图案，相邻两组图案之间保留一个空行。

3
1 1
2 2
1 1

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3
2 4
4 7
8 5

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3
3 7
6 12
15 9

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数据范围与约定

• $1\le t<100$
• $1\le l,c<100$