This sorting is rigidly defined for each type of cancer, based on generations of research looking at how cancers with different spreads and characteristics tend to behave.
Beeline really refers to their lack of stops or distractions when flying home after collecting nectar or pollen, not that they rigidly fly like an airplane through the air.
But in a BBC interview, South Sudan's minister of information Micheal Makuei said the agreement should not be read rigidly although the government was still committed to peace.
The regime derives legitimacy from the electoral system although that system is rigidly controlled to exclude candidates seen as an outright threat to dominance by the clerics.