Need Help On GROUPING Sets Of Rows And Comparison

Hi folks. Hope all the gurus including Brett,Pat Phalen, RdjBarov, r937 are fine. ;)
been so long to ask stupid question. Here's the question and i really need help on this.

i have data that tracks patterns of bus stops from one point to another.
like point a, to point b, point b to point c forms one pattern.
point a to point c , point c to point b should be a different pattern.


create table #journeypatterns (patternid int ,points varchar(100))
go
insert #journeypatterns
select 1 ,'a' union all select 1 ,'b' union all select 1,'c'
union all select 2,'a' union all select 2,'c' union all select 2,'b'
union all select 3 ,'a' union all select 3 ,'b' union all select 3,'c'


select * from #journeypatterns


patternid points
1 a
1 b
1 c
2 a
2 c
2 b
3 a
3 b
3 c


what i want is to get unique pattern value of sequence of points by grouping on patternid. if the sequence of points change, i need a unique value against that pattern.
like for patternid 1, sequence of points a,bc for example should be abc.
for patternid 2, sequence of points a,c,b for example should be acb.
again patternid 3, sequence of points a,bc for example should be abc.

i tried CHECKSUM_AGG which brutally failed in production because the checksum values for each single point when summed produce SAME result for different patterns.

select checksum_agg(binary_checksum(points)) ,patternid
from #journeypatterns
group by patternid

961
962
963

here patternid 2 should be different because sequence is acb. i know checksum is not the right approach for what i need.

I NEED A GENERIC FUNCTION, that marks the pattern differences, my ultimate goal was to create a procedure, whom a patternid should be passed, and it would result the NEXT patternid in the table which has the SAME ORDER OF point sequences.

now folks, i can do this holding all data into a temp table and write a cursor to traverse through each patternid and concatenate the sequence of points.
BUT, using this approach is the ugliest, as it has slow down the process badly and boss is not happy with the performance. the table holds a lot of data.
I NEED a query rather than a cursor on the fly to resolve this.
Here's the query i am using to get the current sequence of a pattern and then i have to search all sequences similarly against it.

declare @patternid int
set @patternid =1
declare @sequence [varchar] (100)
declare @id varchar(10)
declare cr_sequence cursor fast_forward for select points from #journeypatterns where patternid=@patternid
open cr_sequence
fetch next from cr_sequence into @id
while @@fetch_status = 0
begin
select @sequence = isnull(@sequence,'')+@id
fetch next from cr_sequence into @id
end
print @sequence -- next i have code to find the similar sequence for another patternid.... which is not mentioned here but is similar