While it is too early to track the success rate, some common clues to recovery are emerging.

In the days after his death on July 20, 1993, few clues emerged about why he would have wanted to kill himself.

Then, in 1993, a clue to the puzzle emerged from an unlikely source.

Though it has been hard to know how seriously to take these predictions, with less than two years to go, clues are emerging.

Further clues that this is a correct point of view emerge from comparing a computer to a mind.

The other clue emerged when the scientists played Rios the tape of his sister's voice backward.

Another promising clue emerged from the letter, possibly the bomber's only mistake since apparently being seen in 1987.

Nobody is giving away blueprints of their strategies, but some clues have emerged.

On 7 November, it was reported that clues may be emerging.

Little is known or reported about the determinants of participation, but some clues are emerging.