Actually the above statement prints all the lines

S 9912290449 00005941^B{TT}
D
S 9912290450 00005941^B{TT}
R
S 9912290451 00005941^B{TT}
D
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But I want to print only the statemtents which has 'D' and its above line. Yhe output should be something like this

S 9912290449 00005941^B{TT}
D
S 9912290451 00005941^B{TT}
D
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