must is a modal that implies a duty or obligation which is not self imposed but by external rule or duty. ought tois a moral or self imposed obligation or duty.
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not all congruent angles are vertical angles. Vertical angles must share a vertex.
She enjoys doing 'spot the difference' puzzles.There is a difference between happy and sad.What is the difference between these two cakes?
what is the difference between ERD and UML Flowcharts.
what is the difference between commutative and symmetric properties