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 perl -i.bak -F, -ane '
    if ($F[0]+1 == $F[1] and $F[1]+1 == $F[2]) {warn "row $.: $_"} els
+e {print}
' file.csv 2>file.log

for line in file: 
    for i in range(1,4):
        if ($F[0]+ i == $F[1] and $F[1]+i == $F[2]): 
           remove line