it when one event starts another event

There are many events that are important to chains. The main event if chain is the Civil War.

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whoever did this is stupid

Some collective nouns for chains are a length of chain or a reel of chain.

The word chain is also a collective noun, for example a chain of events, a chain of circumstances, etc.

The event in which a heavy ball tied with a chain is thrown is called the hammer throw. The winner is the person who tosses the hammer the farthest.