Riemann sum problem

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I'm confused on how $2[4+0+0.4+1.6+3.6]$ is arrived at instead of $2[1+1.4+2.6+4.6]$

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$(1+0)+(1+0.4)+(1+1.6)+(1+3.6) = (1+1+1+1)+(0+0.4+1.6+3.6)$