}
'/$1/' {

matches - append the current line

H
# get the next line
n
# append that one also
H
# bring it back,but keep the current line in
# the hold buffer. This is the line after the pattern,# and we want to place it in hold in case the next line
# has the desired pattern
x
# print the 4 lines
p
# add the mark
a

}'

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