Ononot — Given d1 = 18, d2 = 19, and dn = d{n-1} + d{n-2} for n \\geq

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Given $d_1 = 18$ , $d_2 = 19$ , and $d_n = d_{n-1} + d_{n-2}$ for $n \\geq 3$ , what is $d_4$ ?