SAN FRANCISCO (AP) -- Apple Inc.'s popular iPad is getting its strongest competition thus far as consumer-electronics manufacturers unveil tablet computers with bigger screens, front-facing cameras for video chatting and more.The iPad has been a smashing success since its April launch, leaving other companies to play catch-up in the suddenly hot market for the keyboardless, touch-screen devices. Rivals are making a bigger push at this week's International Consumer Electronics Show in Las Vegas, betting they can challenge Apple with such features as Android, the popular smart phone software Google Inc. developed to compete with the iPhone;

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