Answer Posted / mahesh

[ PB M2 O/P ]
[-----[ ]--------[/]--------( )----]
[ i ]
[ O/P i ]
[-----[ ]---i ]
[ ]
[ PB O/P M1 ]
[-----[/]----[ ]-------------( )---]
[ ]
[ PB M1 O/P M2 ]
[-----[ ]----[ ]-----[ ]-----( )---]
[ ]

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