The first and last sentences, S1 and S6, of a paragraph are given. Four other sentences, M, N, O, and P, are given which are not in their proper order. Identify the correct order of the sentences.
S1: India led the battle of freedom against British imperialism.
M: This particular technique brought success.
N: We championed the cause of other countries.
O: We fought it with a special technique.
P: We are happy for those that have achieved freedom.
S6: Some countries are still slaves, however.