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In the given circuit, it is observed that the current I is independent of the value of the resistance R6. Then the resistance values must satisfy 

(1) R1R2R5=R3R4R6

(2) 1R5+1R6=1R1+R2+1R3+R4

(3) R1R4=R2R3

(4) R1R3=R2R4=R5R6