Septic systems can also present a problem for those not used to them.

The system presents a pre-selected group of exercises that take 15-30 minutes per day.

In this model, the system only presents the top-ranked documents to the user.

Opponents argue that the system presents a threat to the local population, as it would be targeted in the event of nuclear war.

But one system has got out of whack and presents some difficulties.

The economic system of the country presents several facets.

Often a system will present both magic and psionics.

This system can present difficulties for animals which spend much of their life underground.

The system presents intriguing ideas, but American experts find few that could simply be copied.

Sophisticated systems do not present this problem at all.