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Can I say,

(a) A group of mice stayed in a nest / a hole. The mice gathered for a meeting./They gathered in a hole. The mice thought many ways to escape from the cat.

(b) The mice thought about the ways to escape when the cat caught them. They thought for a long time. Suddenly, a mouse came up with a good idea.

(c)(i) They discussed (about) the ways to escape from the cat.
(ii) They discussed continuously for two hours.
(iii) They discussed and thought about the ways to escape from the cat.
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(a) A group of mice lived in a hole. The mice gathered for a meeting. The mice thought of many ways to escape from the cat.

(b) The mice thought about ways to escape when the cat tried to catch them. They thought for a long time. Suddenly, a mouse came up with a good idea.

(c)(i) They discussed the ways to escape from the cat.
(ii) They discussed continuously for two hours.
(iii) They discussed ways to escape from the cat.

Æsop. (Sixth century B.C.) Fables.
The Harvard Classics. 1909–14.
Belling the Cat
LONG ago, the mice had a general council to consider what measures they could take to outwit their common enemy, the Cat. Some said this, and some said that; but at last a young mouse got up and said he had a proposal to make, which he thought would meet the case. “You will all agree,” said he, “that our chief danger consists in the sly and treacherous manner in which the enemy approaches us. Now, if we could receive some signal of her approach, we could easily escape from her. I venture, therefore, to propose that a small bell be procured, and attached by a ribbon round the neck of the Cat. By this means we should always know when she was about, and could easily retire while she was in the neighbourhood.” 1
This proposal met with general applause, until an old mouse got up and said: “That is all very well, but who is to bell the Cat?” The mice looked at one another and nobody spoke. Then the old mouse said:
“IT IS EASY TO PROPOSE IMPOSSIBLE REMEDIES.”
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Comments  
Can I say,

(a) A group of mice stayed in a nest / a hole. The mice gathered for a meeting./They gathered in a hole. The mice thought many ways to escape from the cat.

(b) The mice thought about the ways to escape when the cat caught them. They thought for a long time. Suddenly, a mouse came up with a good idea.

(c)(i) They discussed (about) the ways to escape from the cat.
(ii) They discussed continuously for two hours.
(iii) They discussed and thought about the ways to escape from the cat.
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 Mister Micawber's reply was promoted to an answer.
Æsop. (Sixth century B.C.) Fables.
The Harvard Classics. 1909-14.

Belling the Cat

LONG ago, the mice had a general council to consider what measures they could take to outwit their common enemy, the Cat. Some said this, and some said that; but at last a young mouse got up and said he had a proposal to make, which he thought would meet the case. "You will all agree," said he, "that our chief danger consists in the sly and treacherous manner in which the enemy approaches us. Now, if we could receive some signal of her approach, we could easily escape from her. I venture, therefore, to propose that a small bell be procured, and attached by a ribbon round the neck of the Cat. By this means we should always know when she was about, and could easily retire while she was in the neighbourhood."
This proposal met with general applause, until an old mouse got up and said: "That is all very well, but who is to bell the Cat?" The mice looked at one another and nobody spoke. Then the old mouse said:
"IT IS EASY TO PROPOSE IMPOSSIBLE REMEDIES."