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Restatements 2

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1. The most common side effect of antihistamines, drugs used to treat sinus problems, is drowsiness. (1) A side effect of most antihistamines, which are drugs commonly used to treat sinus problems, is drowsiness. (2) Many drugs commonly used to treat sinus problems, such as antihistamines, often cause sleepiness. (3) Sinus problems are most commonly treated with antihistamines, drugs which cause drowsiness. (4) Drowsiness is the side effect which occurs most frequently with antihistamines, the drugs used for treating sinus problems. 2. A musical tone made by an acoustic instrument always includes not only a fundamental pitch, but also a series of overtones. (1) Acoustic instruments always produce musical tones which consist of a fundamental pitch, but do not produce the overtone series. (2) A fundamental pitch, and sometimes an overtone series as well, are created in the musical tones produced by acoustic instruments. (3) A fundamental pitch and a series of overtones are both always present whenever a musical tone is made by an acoustic instrument. (4) Both fundamental pitches and the series of overtones which accompany them can only be produced by acoustic instruments. 3. Despite years of effort with sophisticated equipment, researchers have never detected any radio signals from intelligent life in outer space. (1) The detection of radio signals from intelligent life in outer space remains an extremely rare phenomenon, despite years of work by researchers with sophisticated equipment. (2) Without years of effort using the most advanced equipment available, it is unlikely that researchers will ever detect radio signals from intelligent life in outer space. (3) Even with the most sophisticated equipment available, researchers have rarely detected any radio signals which could conceivably have originated with intelligent life in outer space. (4) Radio signals from intelligent life in outer space have never been detected by researchers, despite their years of effort with complex equipment. 4. Predators like Siberian tigers can only survive in environments where large populations of prey animals exist. (1) Habitats which contain large numbers of prey animals are the only ones in which predators like Siberian tigers can survive. (2) In habitats where large number of prey animals are not present, predators such as Siberian tigers find it hard to survive. (3) The only thing which predators like Siberian tigers require from their environments in order to survive is large numbers of prey animals. (4) Only predators like Siberian tigers require environments with large numbers of prey animals in order to survive.

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