What are the 4 running events in a decathlon?

The four running events in a decathlon will signify the beginning and end of each day of competition in the two day decathlon.

Day1-

Day Start- 100 meter dash

Day End- 400 meter dash

Day2-

Day Start- 110 meter high hurdles

Day End- 1500 meter run. (just 100 meters short of a mile)