In reality, a combination of these changes, with different time courses, probably occurs.

However, the details of how this combination could occur are not fully worked out.

While nearly every logically possible combination of experiences can occur, several types are more common than others.

Once a certain combination has occurred it cannot occur again until a new batch is initiated.

Interesting to see, these combinations may not occur again.

The middlegame is the phase in which most combinations occur.

Other similar combinations will occur to the student who has absorbed the principles of balance.

Similarly, additional points might be added where positive combinations occur.

The present combination of the two towns occurred in 1972.

One or a combination may occur at any given time.