A deck of cards contains red cards numbered 1,2,3,4 and blue cards numbered 1,2,3,4,5,6. Let R be the event of drawing a red card, B be the event of drawing a blue card, E be the event of drawing an even-numbered card, and O be the event of drawing an odd card. Drawing the blue 4 is an example of which of the following events? Select all correct answers.