Just make it simple

Level pending

Let there be a sequence denoted by \( a_{k} \) for \( k \ge 0, k \in \mathbb{Z} \). If:

\[ a_0=4 \\ a_1=5 \\ a_2=8 \\ a_3=13 \]

Compute \( |a_{20}-a_{18}| \)

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