Table:
municipality	type	district	area (km square)	population (2010)	pop density (per km square)	no of barangays	municipal mayor

alaminos	3rd class	3rd district	57.46	43526	757.5	15	eladio magampon

bay	2nd class	2nd district	42.66	55698	1300	15	bruno ramos

calauan	2nd class	3rd district	65.40	74890	1100	17	george berris

cavinti	3rd class	4th district	125.54	20809	170	19	melbert oliveros

famy	5th class	4th district	53.06	15021	280	20	renonia b muramatsu

kalayaan	3rd class	4th district	46.60	20944	450	3	teodoro a adao , jr

liliw	4th class	3rd district	39.10	33851	870	33	cesar c sulibit

luisiana	4th class	4th district	73.31	20148	270	23	nestor rondilla

lumban	3rd class	4th district	96.08	29470	310	16	reynato añonuevo

mabitac	5th class	4th district	80.76	18618	230	15	ronald sana

magdalena	4th class	4th district	34.88	22976	660	24	david aventurado jr

majayjay	4th class	4th district	69.58	26547	380	40	victorino c rodillas

nagcarlan	2nd class	3rd district	78.10	59726	760	52	nelson osuna

paete	4th class	4th district	39.47	23523	600	9	mutuk bagabaldo

pagsanjan	2nd class	4th district	26.36	39313	1500	16	girlie maita sanchez ejercito

pakil	5th class	4th district	46.50	20822	450	13	vipops r martinez

pangil	4th class	4th district	45.03	23201	520	8	jovit reyes

pila	3rd class	4th district	31.20	46534	1500	17	boy quiat

rizal	5th class	3rd district	27.90	15518	560	11	antonino a aurelio

santa cruz	1st class	4th district	38.59	110943	2900	26	domingo dennis g panganiban

santa maria	4th class	4th district	108.40	26839	250	25	cindy carolino

siniloan	2nd class	4th district	64.51	35363	550	20	eduardo tibay

I need you to conduct the following task:
Given this table image, find all merged table cells and return merged regions with the JSON {'top-left':(R1, C1), 'bottom-right':(R2, C2)},  where (R1, C1) and (R2, C2) indicate the (row_id, column_id) of top-left and bottom-right cells in the merged regions, respectively. You should remember that row id and column id start from 1.

This table does not contain any merged cells.