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Dust storms often originate from discrete source points , and this image shows several source points , one of which is annotated , in eastern Algeria . Whitish to yellow-green flared collars , with collar backs often at an angle to the stem . Phorid flies often become pests in commercial kitchens , hospitals and mausoleums . Even one who has pesos often cannot buy anything with them . In fact , building consensus from starting positions that may be very far apart and held by powerful market players often requires much discussion , vigorous debate and argument , negotiation and , on occasions , confrontation among market players . And we learned that performances are played today as in Shakespeare 's time : They can run on for hours , and the players often interact spontaneously with spectators .