Bingo card generator A Bingo card is five columns of five squares each, with the middle square designated "FREE".  Numbers cannot duplicate.

The five columns are populated with the following range of numbers:


B:1-15
I:16-30
N:31-45
G:46-60
O:61-75


In as few characters as possible, output a string that can be interpreted as a randomized Bingo card.
For example: 


  1,2,3,4,5,16,17,18,19,20,31,32,33,34,35,46,47,48,49,50,61,62,63,64,65


This example is not randomized so that I can show that column 1 is populated with 1,2,3,4,5.  Also note that the free space has not been given any special treatment because the front-end that interprets this string will skip it.

Another example would be:


  1,16,31,46,61,2,17,32,47,62...


In this example, the output is by row instead of by column.

A third example might be:


  01020304051617181920313233343546474849506162636465


This is the same output as the 1st example except in fixed length.
PHP, 86
for($o=[];25&gt;$i=count($o);){$n=rand(1,15)+($i-$i%5)*3;$o[$n]=$n;}echo implode(&quot;,&quot;,$o);