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Can any one explain below condition : OS

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Let m[0]....m[4] be mutexes (binary semaphores) and P[0].......P[4] be processes. 
Suppose each process P[i] executes the following:

     wait (m[i]; wait (m(i+1) mode 4]);
     ........... 
     release (m[i]); release (m(i+1) mod 4]);
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can any one explain me the following thing...
let m[0] ...m[4] be mutexes (binary semaphores) and p[0] and p[4] be processes ...suppose each process p[i] executes the following wait(m[i]);wait(m[i+1]mode 4]); ................ release(m[i];release(m[(i+1)mod4]); what is meaning of all these things?
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