Table:
John Kelvin Koelsch

Lt(jg) John K. Koelsch

Nickname(s)	"Jack"
Born	(1923-12-22)December 22, 1923
London, England
Died	October 16, 1951(1951-10-16) (aged 27)
North Korea
Place of burial

Arlington National Cemetery

Allegiance	United States of America
Service / branch	United States Navy
Years of service	1942 — 1951
Rank	Lieutenant (Junior Grade)
Unit	Composite Squadron 15
Torpedo Squadron 97
Torpedo Squadron 18
Helicopter Squadron 1 (HU-1)
USS Princeton (CV-37)
Helicopter Squadron 2 (HU-2)
Battles / wars	Korean War
Awards	Medal of Honor
Purple Heart

A table may have multiple merged cells and we can represent a merged cell region by a JSON {'top-left':(X1, Y1), 'bottom-right':(X2, Y2)}. Here, '(X1, Y1)' and '(X2, Y2)' denote the coordinates (row_id, column_id) of the top-left and bottom-right cells of the merged regions, respectively. Now, based on the shown table image, please find all merged cells in this table and return their representations in the above format. Keep in mind that row and column IDs start from 1.

The merged cell area is: {'top-left':(1, 1), 'bottom-right':(1, 4)}.