Which of the was not a key principle of the Mandate of Heaven

These are the four basic principles of the Mandate of Heaven: The right to rule is granted by Heaven (天 Pīnyīn: Tiān). There is only one Heaven therefore there can be only one ruler. The right to rule is based on the virtue of the ruler.

the language dates from the contacts of arabian traders with the inhabitants of the east coast of africa over many centuries. under arab influence, swahili originated as a lingua franca used by several closely related bantu-speaking tribal groups.

whose power in the senate is equal to the power of the speaker of the house?