Major Description
In the following example, the CONTAINS condition counts also overlapping Unit-annotations:
200mg/25mg
with Unit-annotations on both "mg" snippets and on "mg/25mg".
If you block on the two measurements around the slash, i.e. on "200mg" and on "25mg", the CONTAINS(Unit) condition returns 2 units in the case of "200mg" and 1 unit in the case of "25mg".