Are there any special rules for Letter Equations?
Letter Equations are well known phrases or facts where the key words have been replaced with the first letter of that word. These are in the form of an equation, which contain a number, an = sign and the rest of the obscured phrase or fact. The number in the equation should not match the prefix of the missing word. Examples of illegal Letter Equations are: “5 babies in a quintet”, “6 babies in a sextet”, “7 babies in a septet” . Letter Equations should also relate to things that are fairly common knowledge. Archaic measurements, fictional material, little known scientific minutiae or material requiring specialized knowledge may be considered unsuitable.
