Python where all characters are "o" except that an x pattern of "x" characters has been drawn from the corners of the square. On the first line, the first and last characters are "x"; on the second line, the second and second-from-last characters are "x"; and so on.

# For example, the call of xo(5) should produce the following outputs:

xooox oxoxo ooxoo oxoxo xooox