With six minutes to go, second-half substitute Vincent Barnabas made a solo run into the Sudanese danger zone and was brought down for a penalty.
South Africa, which already provides troops to the UN force, could play a bigger part in the danger zone.
Even though Jaduguda has been in operation for more than 30 years, as many as seven villages still stand within one and a half kilometers of the danger zone.
The three highest-placed Welsh Magners League teams avoid having to take on Italy's third-placed club and the Blues put themselves out of the danger zone with a 20-12 win over Munster on Sunday.
And today's announcement by Spain that there was no growth at all in its economy won't do anything to pull its bond yields significantly further away from that 7% danger zone, where a possible Italian bailout could be followed by a Spanish rescue.
Once you go above two slugs a day then you get into the danger zone.
The decisive goal came on 68 minutes, with Ledley taking advantage of some sloppy defending to saunter into the danger zone and heading in a free kick from Ki.
Wing Blackwood grabbed a try in the corner nine minutes later after a pass on the left in the Salford danger zone, which full-back Damien Quinn, who had landed Chalk's conversion, booted as well.
And that is without counting the danger of a general contagion in weak euro-zone economies.
Men who get tested for prostate specific antigen, or PSA, have a 13.5% chance of landing in the danger zone.
Apparently the FDA is concerned that the higher drug concentrations produced by the long-acting version will push some patients into the danger zone, especially patients with kidney problems, a common complication of diabetes.
Yet the danger is that the euro zone will end up with a messy system in which the ECB can cut off a bank while leaving national authorities to argue over the bill.
Munster had made a powerful start and it was no shock when they edged in front with a simple Paul Warwick penalty after Daryl Gibson sneaked offside in his own danger zone.
He believes there is a danger that recent economic progress in neighbouring areas could be stalled if firms decide to switch to the enterprise zone.
But there is a danger that the result will be a bureaucratic mess that polarises the haves and have-nots of the euro zone, while further dividing the euro-zone and non-euro-zone members of the European Union.
ECONOMIST: Plans for common supervision could easily turn messy
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