In the given diagram assuming a1, a2, a3...

In the given diagram assuming `a_1`, `a_2`, `a_3`, `a_4` upwards the correct relation is

`4a_1 -2a_2 -a_3 -a_4 = 0 `

`4a_1 +2a_2 +a_3 +a_4 = 0 `

`2a_1 +4a_2 +4a_3 +a_4 = 0 `

`4a_1 -2a_2 +a_3 +a_4 = 0 `

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