Three pivotal days in cases against Tsarnaev friends

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Robel Phillipos, a friend of Dzhokhar Tsarnaev, was found guilty of lying to authorities investigating the Boston Marathon bombings. Two other friends, Dias Kadyrbayev and Azamat Tazhayakov, have been convicted of obstruction of justice charges. Here are key events in the cases against Tsarnaev's friends.