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(Note to authors - reference paragraphs must begin with a number and be preceded by a blank line.)Variables: Defines the variables based on information in the description.Each variable definition consists of the variable name followed by variable values, all separated by commas.To enter items into the table, click the item you want to enter and note that it is now highlighted in yellow.
In the example above we have variables Name, Hair, and Age with three values of each.
The one-to-one requirement means there there cannot be two 13 year olds, none of the kids can be bald, etc.
For tips on how to use this grid, click on the Solving Tips button or follow the Solving Tips page link found on the main puzzle page.
Below each column of the table is a list of the variables that may be entered into that column. Only the items directly underneath the column may be entered into that particular column.
These may be of two forms: Order rules; "John is older than Mary" or "Pete is one year younger than John.". Here we know the "distance" between two values but not the direction: "Mary and John were born two years apart".
If Rules: These are rules that specify relationships that are conditionally true (or false) based on the truth (or falsity) of some other relationship.For over 15 years Mensa Page-A-Day calendars have provided several puzzles a year for my programming pleasure.Coding "solvers" is most fun, but many programs also allow user solving, convenient for "fill in the blanks" type.The cells at intersections contain "T" if the relationship (e.g.the 13 year old has red hair) is true, "F" if the relationship is false ("the 13 year old does not have red hair") and "U" if the truth of the relationship is unknown. If we reached a state where all "U"s have been replaced, the problem is solved.You'll commonly find numbered paragraphs at the bottom of the description pages.These may be used as reference numbers while defining facts and rules.This grid is provided to help you solve the logic problem.This grid can be used in the traditional method, using dots and x's.Support DFF - Shop If you shop at Amazon anyway, consider using this link. Thanks If you benefit from the website, in terms of knowledge, entertainment value, or something otherwise useful, consider making a donation via Pay Pal to help defray the costs.(No Pay Pal account necessary to donate via credit card.) Transaction is secure.