Replace Na in column with conditions in R

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Hello everyone I have a dataframe such as :

    COL1 COL2  COL3 
    G1   SP1_1 1
    G1   SP1_2 2
    G1   SP1_3 NA
    G2   SP1_4 1
    G2   SP1_4 1
    G2   SP


                      
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