------------------------------------------
{compObjWrittenByActivityBeforeActivity(x19,a12,a12,8), subsActivityBeforeActivity(a2,a2,12)}

{}

{}

{compObjWrittenByActivityBeforeActivity(x19,a21,a12,8), compObjWrittenByActivityBeforeActivity(x19,a21,a3,11)}

{compObjWrittenByActivityBeforeActivity(x19,a2,a21,8), compObjWrittenByActivityBeforeActivity(x19,a2,a21,12), compObjWrittenByActivityBeforeActivity(x19,a2,a2,16)}