Table:
Garfield Park Branch
Overview
Status	Closed
Locale	Chicago, Illinois, U.S.
Oak Park, Illinois
Forest Park, Illinois
Termini

Ogden
Des Plaines

Stations	22
Service
Type	Rapid transit
System	Chicago "L"
Operator(s)	Chicago Transit Authority (1947-1958)
Chicago Rapid Transit Company (1924-1947)
Metropolitan West Side Elevated Railroad (1895-1924)
History
Opened	June 19, 1895
Closed	June 22, 1958
Technical
Track gauge	4 ft 8+1⁄2 in (1,435 mm)
Electrification	Third rail, 600 V DC

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Route map

Legend

Metropolitan Main Line
to Wells Street and The Loop

Ogden

Hoyne

Western

California

Sacramento

Kedzie

St. Louis

Garfield Park

Pulaski

Tripp

Kilbourn

Belt Railway of Chicago

Cicero

Laramie Yard

Laramie

Laramie Avenue

Lockwood Avenue

Flournoy Street

Lexington Street

Central

Central
Avenue

Austin

Austin Boulevard

Chicago
Oak Park

Humphrey Avenue

Lyman Avenue

Taylor Avenue

Lombard Avenue

Lombard

1957 temporary
diversion

Cuyler Avenue

Ridgeland

Ridgeland
Avenue

Elmwood Avenue

Gunderson Avenue

Gunderson

East Avenue

Oak Park

Oak Park
Avenue

Kenilworth Avenue

Home

Home
Avenue

Harlem Avenue

Oak Park
Forest Park

Harlem

Circle Avenue

Hannah

Hannah Avenue

Baltimore and Ohio
Chicago Terminal Railroad

Congress branch

Des Plaines

Des Plaines Avenue

Westchester branch
to Mannheim/​22nd

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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':(x, y), 'bottom-right':(z, w)},  where (x, y) and (z, w) 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.

The merged cell region is: {'top-left':(1, 1), 'bottom-right':(1, 2)}.