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Division Issue

It's Alice's birthday and Bob is preparing an exquisite gift for her! Bob has an array $A$ of $N$ elements. Bob wants to gift Alice this array on her birthday. However, An array only piques Alice's interest if and only if **for every 2 consecutive elements** in the array, Alice can find some number **other than $1$** that divides both the elements. Bob can delete **any one element** of the array

HINT LADDERno hints yet
L1 Observation
L2 Technique
L3 Approach
L4 Pseudo-code
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L5 Full solution
L5 unlocks only if you insist twice
solution.cppC++17

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