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How to delelete a whole line starting with a word e.g i have a text =>

abcdef ghij 1234 567
abcdef ghij 1111 222 wssd
wqywtqy hjhjh 8989
sashjah iusiasu 98989

I want to remove all line starting with abcdef
Output should be :

wqywtqy hjhjh 8989
sashjah iusiasu 98989

these two line should ...