1.   Indeed, the cross-equation restrictions May become so complicated as to make computation of the restricted model difficult or impossible in practice.

2.   Other officials expressed concern that the proposed mechanism might actually prove to make secession impossible in practice.

3.   That task was all but impossible in three of the four counties where the Democrats have called for a new tally.

4.   The income from admission fees helps the monks finance a lifestyle that might otherwise be impossible in the modern world.

5.   Without easy access to wealthy first world Markets, economic development is difficult if not impossible in the second and third worlds.

6.   It is impossible in this publication to give a resum of these.

7.   In addition, interpreting the activity statistics was impossible in the absence of any information on demand, need, quality of care and outcomes.

8.   Off road racing... is all about mud... forest tracks... driving wheels through the impossible in machines that look improbable...

9.   If both remain silent, or each accuses the other, it is impossible in law to obtain a conviction against either.