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How about
tac file | awk '$1 == 40 {TMP = $2} $1 == 20 {print $0, "AND", TMP} $1 !~ /^[24]0$/' | tac
10 bonuses D
20 MATCHED AND (SOL=30)
30 UPD COL
20 NOT MATCHED AND (SOL=30)
30...