I have a text file with the following data:
var_a var_b var_c xx xx var_d
12 6/0 25 28
12 6/0 25 28
12 23 6/0 25 28
12 23 6/0 28
The first line contains column headings. Note that "xx xx" belongs to the same column and not all cells contain a data point.
How do I cleanse this data?