For the Welsh examining board, the WJEC, those jagged edges look very much today like the horns of a dilemma.
There's nothing especially original in the Artic Monkeys' music, but they perform it with a swagger, the jagged edges deliberately intact.
But jagged edges are hard to spot, viewing angles are extraordinary and it shrugs off direct sunlight as a minor inconvenience.
Until the wreck is broken up, officials are monitoring it and hoping its jagged edges don't injure any pilgrims flocking to the site.
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Imagine a large cartographic quilt, tightly stitched in parts but with ragged and jagged edges, with bright patches and threadbare ones in the middle.
The jagged edges of devolution have rarely seemed so pointed.
The fourth side was partly closed by a high wall, surmounted by jagged edges of broken glass set firmly in old lime plaster, and pierced in its center by a wide entrance-way.
They then heated the crystal for 24 hours to up to 2, 700 degrees Fahrenheit--a process that forces the crystal surface to reorganize itself into a sawtooth pattern at three-nanometer intervals (at that breadth, 30, 000 such jagged edges side by side would be as wide as one human hair).
This slices much more neatly into eyeballs to remove a cataract than standard tools because its edges are less jagged.
To the west are the saw-edges of glacier-encrusted rock and ice, serrated by more than 30 jagged peaks heavy with snow, the highest of which is 6, 768m-high Huascaran, the tallest mountain in the tropics.
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