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The lahar knocked down trees as large as 2-3 m in diameter and encased the logs as well as the lower parts of still-standing trees in muddy rock debris about 5 m thick . Patients receiving antibiotics are at high risk because the drug knocks out beneficial intestinal bacteria , allowing the bad bug to move in and produce toxins . For the moment it was the British Government that had to have a hole knocked in it . " I pushed it back into position but another gust knocked it back again . '' There are about 50 demonstrators ahead and we're going to let them finish their march if it costs us a head knocking .