Heavy make-up or a mask will also work, as will tilting your head at a 15-degree angle, which fools the software into thinking you do not have a face, according to an online guide produced by hacktivist group Anonymous.

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And there is Mario Sepulveda, whose face has become familiar in front of the camera, as the guide to the men's underground home.

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"Young girls today face a new generation of pressures that leave too many suffering stress, anxiety and unhappiness, " said Chief Guide Liz Burnley.

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