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-
- % THE UNDEVELOPED DATA IS IN "Tales".
-
- episode :-
- tab(15),
- write('" ALL AT SEA. "'),nl,
- tab(15),
- write('-------------------------.'),nl,nl.
-
- /*
- In 1719, the year that "Robinson Crusoe" was first published, five
- real-life shipwrecked mariners who had been marooned on distant islands
- were rescued and brought back to Britain. From the clues below, can you
- work out each man's name, his rank and ship, which sea it was lost in,
- and in which year he was marooned ?.
-
- 1. Hugh Flint had served on a ship with a two-letter name.
-
- 2. Ironically, it was because he stayed with his ship that captain John
- Moody wasn't drowned with his crew.
-
- 3. The ship whose first mate was marooned for three years wasn't the
- Bristol Lass.
-
- 4. The Gryphon went down in a Caribbean hurricane.
-
- 5. Will Tweed of the Dog Star was shipwrecked before the able seaman but
- after the man who survived the loss of his ship in the Timor Sea, who
- wasn't Hugh Flint.
-
- 6. It was in 1713 that one man was shipwrecked in the Indian Ocean.
-
- 7. Both Ben Duncan, who was marooned on an island in the South Pacific,
- and the man shipwrecked in 1704 were ship's officers, unlike the man
- who survived the loss of the Alexander.
- */
-
- group([ad1716,ad1713,ad1710,ad1707,ad1704]).
- group([ben,hugh,john,tom,will]).
- group([ab,captain,cook,mate1,mate2]).
- group([alexander,bristollass,dogstar,gryphon,stsimeon]).
- group([caribbean,indianocean,seaofjapan,southpacific,timorsea]).
-
- c(captain,john).
- c(ad1716,mate1).
- c(gryphon,caribbean).
- c(will,dogstar).
- c(ad1713,indianocean).
- c(ben,southpacific).
-
- i(hugh,alexander).
- i(hugh,gryphon).
- i(ad1716,bristollass).
- i(will,ab).
- i(will,timorsea).
- i(will,ad1716).
- i(will,ad1713).
- i(will,indianocean).
- i(will,ad1704).
- i(ab,ad1704).
- i(ab,ad1707).
- i(timorsea,ad1716).
- i(ab,timorsea).
- i(timorsea,hugh).
- i(ben,ad1704).
- i(ben,ab).
- i(ben,alexander).
- i(ben,cook).
- i(ad1704,ab).
- i(ad1704,cook).
- i(ad1704,alexander).
- i(alexander,captain).
- i(alexander,mate1).
- i(alexander,mate2).
-
- % The following data has to be reconsidered due to an
- % "Insufficient data." signal which will be evident where only
- % the simple facts above are offered.
-
- % Will Tweed was shipwrecked before the ab.
- % The ab was NOT shipwrecked in 1716.
- % Will Tweed was shipwrecked before the ab.
- % Will Tweed was shipwrecked after the Timor Sea man.
- % Hence Will was not shipwrecked in 1704, 1713 or 1716.
- % Hence Will was shipwrecked in 1707 or 1710.
- % The ab was shipwrecked in either 1707 or 1710, or 1713.
- % The Timor Sea man was shipwrecked in 1704 or 1707.
-
- % Constructions to deal with the newly developed data could take
- % the form:
-
- do :-
- i(timorsea,ad1704), % Then c(timorsea,ad1707) obtains.
- bar(c(will,ad1710)),
- assert(c(will,ad1710)),
- fail.
-
- do :-
- i(timorsea,ad1707), % Then c(timorsea,ad1704) obtains.
- bar(c(will,ad1707)),
- assert(c(will,ad1707)),
- fail.
-