What is the firing order of a four stroke I.C engine?

What is the firing order of a four stroke I.C engine? সঠিক উত্তর 1-4-3-2

in an opposed 4-cylinder engine, the firing orders are "1432" or "1234". In this engine, two times two opposite pistons move away from one another or towards each other, and the cylinder angle is basically 180°. 
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