[SOLVED] Identifying the max in a group using PowerQuery

I have a table:

trip_id	stop_sequence
Y1	1
Y1	2
Y1	3
Y1	4
Y1	5
Y2	1
Y2	2
Y2	3
Y2	4

I want to add a custom column that has a value of TRUE for the record which has the highest value of stop_sequence within a group that is grouped by trip_id. In my case, the 5th and 9th row will have TRUE.

What should be the expression of the custom column?

let a = Table.SelectRows(#"Changed Type", (x)=> x[trip_id] = [trip_id]),
b = List.Max(a[stop_sequence])
in if b = [stop_sequence] then true else null