I have some data and I would like to count the number of “Ven+M”
How many duplicate numbers are there? and keeps it to next step
ven+m
1000003301
1000003303
1000024101
1000024101
1000035901
1000035902
1000055901
1000055901
1000055901
1000055901
1000055901
1000055902
1000055902
1000055903
1000055903
1000055903
1000063603
1000063603
1000063603
1000208701
1000208702
1000208703
1000299901
1000299901
1000299903
1000299903
1000299903
1000590412