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The same question 
use ¬isdefined(d)
d is undefined (here is the bug) then applies to c ≠ d ∨ d ≟ false
c ≠ d is always true
d ≟ false is always false
so true ∨ false is always true
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Note: it is not possible to find the reason for d=undefined just from the image.
This would require the ggb-file instead of jpg.
use ¬isdefined(d)
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