Find the measures of the angles of \( \triangle G H J \) , where \( \overline { G H } \) is a diameter of \( O 0 \) , and chord \( \overline { G J } \) intercepts an arc with a measure of \( 70 \) .

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\( m \angle J = \)

\(m \angle H = \)

\( m \angle G = \)