What is mean by constitution? Is the body of fundamental principle and rules by which a country is governed. Every country has these principles, but they differ from one country to another.
In some countries, the constitutions are written and rigid because these fundamental rules have been codified and complied into single document and the method of amending the constitution is difficult. In order countries such a great Britain, the constitution is unwritten and flexible because the constitutional rule has not been codified and thus, the method of amendment is relatively easy.
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From @abidemi01