Bingo Card
A flat card made of cardboard or non-reusable paper which contains
25 squares arranged in five vertical and five horizontal rows.
The letters B, I, N, G, O are pre-printed above the five vertical
columns, with one letter appearing above each column.
The center space is marked "free." The printed numbers
on the card correspond to the following arrangement: 1 to 15
in the B column; 16 to 30 in the I column; 31 to 45 in the N
column; 46 to 60 in the G column and 61 to 75 in the O column.
