There are numerous similar puzzles, giving letter sequences that rarely occur in words. The most-notable of these is the "-dous" puzzle of finding words ending in "-dous", which was popular in the 1880s. This took various forms, sometimes simply listing all words or all common words, sometimes being posed as a riddle, giving the three common words, ', ', and ', and requesting the rarer fourth, which is '. This form originated in 1883, with an A.A. of Glasgow writing to George Augustus Henry Sala in his "Echoes of the Week" column in the "Illustrated London News."