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문제

Miss Fotheringale is teaching her maths class about plotting graphs. As a first exercise, she wants them to plot a linear graph y = ax + b for values of x from 0 to 10 inclusive.

She wants you to help by writing a program that outputs the correct answers to make it easier for her to mark her pupils' work.

입력

The first line of input is a single number N, 0 < N < 30, a positive integer that tells the number of graphs to be plotted.

N lines then follow, each representing one graph to be plotted. Each line contains 2 non-negative integers, A and B, 0 <= A, B <10, being the values of a and b for the graph. A and B will not both be 0.

출력

For each graph, firstly output the equation being plotted on a line by itself. Under this must be the graph. All points on the axes, plus points on the graph must be represented by the * character. The x axis must contain the points 0 to 10 from left to right, the y axis the points 0 to the maximum value from bottom to top.

예제 입력

2
1 0
2 2

예제 출력

y = 1x + 0
*         *
*        *
*       *
*      *
*     *
*    *
*   *
*  *
* *
**
***********
y = 2x + 2
*         *
*
*        *
*
*       *
*
*      *
*
*     *
*
*    *
*
*   *
*
*  *
*
* *
*
**
*
*
*
***********

힌트