Very minor library change to promote readability of output: eliminate spaces in the string representation of Ratios. Currently, a Ratio appears as a pair separated by " % ". The spaces that flank "%" make for confusing output. Example: [1 % 2,1 % 3,1 % 4,1 % 5,1 % 6] The spaces suggest that "," binds more tightly than "%". I claim that [1%2,1%3,1%4,1%5,1%6] is much more readable. It also saves paper and/or screen area. I suspect that the spaces came in to make it easier to find the division point in a lugubrious Ratio like 123456789%987654321 True enough, but such numbers are too incomprehensible to get much scrutiny anyway. I, at least, find that all I do with Ratios much more complicated than 355%113 is squirrel them away in tables that only a computer is likely to read seriously, or edit them into some other form, e.g. for Sloane's Encyclopedia of Integer Sequences. Doug McIlroy