References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+Re\:\s+Re\:\s+Re\:\s+\[O_P_E_R_A_\]\s+What\s+type\s+of\s+radio\s+i\s+need\s+\[modulation\]\s+in\s+order\s+to\s+use\s+Opera\s+mode\.\s*$/: 1 ]
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