propogation delay in two bit full adder failure TBW

OP (Company: Pillai) #3116884
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I have written code for two bit full adder(structural). i have provided 
2 nsec delay to each gate.1 bit full adder working properly but there is 
failure for two bit full adder .I am attaching the code and test bench 
waveform. please provide me solution as early as possible
Attached files:

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