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The shaded answers must be Playfair-encoded before entry. A Playfair codesquare comprises a keyword (ambidextrously in the example shown to the left) in which no letter recurs, followed by the rest of the alphabet in order, I doing duty for I and J. To encode a word, first split it into pairs of letters, e.g. SH ER PA. Each pair of letters is then seen as forming the opposite corners of a rectangle within the codesquare, the other two corners being the encoded form. Thus SH becomes LG (not GL, which HS would give). Where a pair of letters appears in the same row or column, the coded form is produced from the letters immediately to the right of or below each respectively (ER becomes XO). For the last letter in a row or column the first letter in the row or column becomes the coded form, so PA becomes AE. When all the pairs are coded the word is joined up again, giving LGXOAE in this example. |
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