I recently bought a Portuguese-English Dictionary. It has 647 pages of English words (with Portuguese meanings) and 450 pages of Portuguese words (with English meanings). Take a guess at which letter the words start with on the middle page of the Portuguese -> English section, i.e. 225 pages from the start of that section. If the words were evenly split the answer would be M or N. If the words before M outnumbered the words after M, the middle page words might start with K. Have a guess at what it was. I'll post the answer in a day or two.