\b Each numeric clue describes the number of towers that can be seen
if you look into the square from that direction, assuming that
shorter towers are hidden behind taller ones. For example, in a
-5\by.5 grid, a clue marked \q{5} indicates that the five tower
+5\by\.5 grid, a clue marked \q{5} indicates that the five tower
heights must appear in increasing order (otherwise you would not be
able to see all five towers), whereas a clue marked \q{1} indicates
that the tallest tower (the one marked 5) must come first.