The split into sunni and shia divisions of islam can be traced to

we will reach the goal of freedom in birmingham and all over the nation,

the section of the chart that represents a point at which a bill needs approval from a majority of people in both chambers to advance is j, as this is the only section before the bill becomes law which has both rows (symbolizing the chambers) converging into one, meaning that the two parts of the congress have to approve of it before it can march on with the process.