Please create a BASH script with the following guidelines:

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Given a file, replace all iterations of the word "ABC" with "DEF" from the 5th line, and until the end (in only those lines that contain the word "MNO")

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GivenFile1.txt contains the following:

SHABC

CHEFG

STEFG

Test1

SHABC

CHEFG

STABC

Test2

SHABC

CHEFG

STEFG MNO