A student performed the experiment of determination of focal length of a concave mirror by $u-v$ method using an optical bench of length 1.5 meter. The focal length of the mirror used is 24 cm . The maximum error in the location of the image can be 0.2 cm . The 5 sets of ( $\mathrm{u}, \mathrm{v}$ ) values recorded by the student (in cm) are: $(42,56),(48,48),(60,40),(66,33),(78,39)$. The data set(s) that cannot come from experiment and is (are) incorrectly recorded, is (are)