What is the digraph substitution cipher cracked by Lord Peter Wimsey and Harriet Vane in Dorothy L. Sayers’s book Have His Carcase?

What is the digraph substitution cipher cracked by Lord Peter Wimsey and Harriet Vane in Dorothy L. Sayers’s book Have His Carcase? Correct Answer Playfair

Lord Peter Wimsey and Harriet Vane crack the Playfair digraph substitution cipher in Dorothy L. Sayers’s book Have His Carcase.
Bissoy MCQ

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Which author’s novels feature detective Lord Peter Wimsey and mystery writer Harriet Vane?
Peter belongs to Town A and Paul belongs to Town B. They start their journeys towards each others towns following the same route at the same time. They meet somewhere on the way and continue with their journeys. After meeting Paul, Peter takes another 13.5 hrs to reach his destination while Paul takes another 6hrs to reach Peter's town. If Peter travelled at the speed of 30 kmph, what was Paul's speed in kmph?
Ten books are arranged in a row following a certain sequence. Among them 3 are History , 3 are Economics, 2 are Maths and 2 are English. From the left, there is an English book between a History and Maths book, a history book between a Maths and an English book, an Economics book between an English and a Maths Book. a Maths book between two Economics books and two Economics two Economics book between a Maths and a History book. Book of which subject is at the sixth position from the left?
Ten bools are arranged in a row following a certain sequence.Among them 3 History,3 are Economics, 2 are Math's and are English.From the left,There is English book between a History and Math's book, a History book between a Math's and an English book, an Economics book between an English and a Math's Book Math's book between two Economics books and two Economics book between Math's and a History book.Book of which subject is at the sixth position from the left?
S1:This weather-vane often tops a church spire, tower or high building.
P :They are only wind-vanes.
Q :Neither alone can tell us what the weather will be.
R :They are designed to point to direction from which the wind is coming.
S :Just as the barometer only tells us the pressure of air, the weather-vane tells us the direction of wind.
S6:The weather-vane can, however give us some indication of other.

The Proper sequence should be:
Lord Peter Wimsey is a fictional amateur:
Among four books, Book1 is twice as heavy as Book 2. Book 3's weight is half of Book 2's weight. Book 4 is 60 grams more as compared to Book 2 but60 grams less as compared Book 1. Which book is heaviest?
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In the following question the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ passage is split into fourparts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/passage and find out which of the four combinations iscorrect 1. My friend Peter went to live in a village.
P. But it was a very slow animal.
Q. So Peter bought a donkey for five hundred rupees.
R. One day his neighbour told him that he must buy a donkey.
S. Every family there had a donkey to carry things for them.
6. It did not like to work.
A shopkeeper has 11 books of same cost price. He sells the first book at certain price, then he sells second book at a price which is Rs. 1 less than the selling price of first book and then he sells third book at a price which is Rs. 1, less than the selling price of second book. Following this pattern, he sold all 11 books. If he sells sixth book at its cost price. Find the over-all percent profit or loss on selling all 11 books = ?