Listing column headings based on cell values

Sorry, I didn't provide my solution.
See attached example sheet for solution. I needed to tranpose my table first - maybe someone else has a way of doing it without tranposing?

	A	B	C	D	E	F	G	H	I	J
1		Role 1	Role 2	Role 3	Role 4	Role 5			Drop down list of Permissions:	Permission 1
2	Permission 1	y		y		y
3	Permission 2		y		y
4	Permission 3	y		y		y			What I want to appear:	Role 1
5	Permission 4			y	y					Role 3
6	Permission 5	y	y		y	y				Role 5

j4=TOCOL(FILTER(B1:F1,INDEX(B2:F100,MATCH(J1,A2:A100,0),)="y"))

Thanks heaps, that's a lot easier than transposing the data to a new table. Much appreciated

Follow up question for anyone able to help...

I Need a new filter of Office titles that hold teh relevant roles based on the permissions.
The attached sheet shows what I need in the blue areas.

Thanks heaps in advance.

N17=unique(filter(choosecols(hstack(tocol(ifna(n2:n7,o2:s7)),tocol(ifna(o2:s7,n2:n7))),1),isnumber(match(choosecols(hstack(tocol(ifna(n2:n7,o2:s7)),tocol(ifna(o2:s7,n2:n7))),2),l17:l18,0))))

Thanks for that, much appreciated!