unchecked

The Earth's a Theefe, / That feeds and breeds by a compoſture ſtolne / From gen'rall excrement: each thing's a Theefe. The Lawes, your curbe and whip, in their rough power / Ha's vncheck'd Theft.

Java exceptions fall into two categories, called checked and unchecked exceptions. When you call a method that throws a checked exception, the compiler checks that you don't ignore it. You must tell the compiler what you are going to do about the exception if it is ever thrown. […] On the other hand, the compiler does not require you to keep track of unchecked exceptions. […] A checked exception describes a problem that is likely to occur at times, no matter how careful you are. The unchecked exceptions, on the other hand, are your fault.

This pseudocode is unambiguous if we know that the previous state of all the boxes is "unchecked." Because we can't be sure of that in buggy code, a better model might be: […]

If there are W_1 "unchecked" whites (that is, those which enter into the solution of one clue only), and W_2 "checked" whites (those which enter into the solution of two clues), then the mean word length will be (W_1+2W_2)/C, where C is the number of clues. […] Acceptable (if unwelcome) difficulties arise when the initial letters of words occupy unchecked squares, because no hint then derives from other clues as to how that word will start. In six consecutive crossword puzzles in The Times, 16 per cent of the words had unchecked initial letters.