translinear principle of mosfet

Hi i know translinear principle is nothing but the relation of transconductance and the collector current and also MOSFET in the sub threshold region have a linear behaviour. So my doubt i am not able to find if a topology of transistors build is in the translinear closed loop. Will transistor only in closed loop form the translinear network???? Also i read they have to be even in the loop. What if the transistors in the loop are odd????

Also say when 4 transistors are said to be in closed loop how would their connections be. Closed loop as in (for nmos) will the drains and gate of all transistors be connected forming a closed loop. Is it right???? Pls correct me if wrong.... i know very basic question but there are so many topologies and when try to learn simple ones i am not able to which all transistors form a TL loop, when many other transistors are connected additionally with a translinear circuit. Is there any way to identify a translinear circuit just by the connections??? thank you!!!

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Take this translinear circuit for eg...the 6 transistors form a two translinear loop. one of M1,M2,M3 and M4 and the second translinear loop of M1,M2,M5 and M6.... this is fine.. But why cant M3,M4,M5 and M6 considered a loop??? Becuase they also seem to be like a closed loop..