List I  List II
A Essential patent 1 intentionally withheld from issuance and publication for an extended period
B submarine patent  2  provides legal protection for the ornamental design of a manufactured article.
C Design patent 3 asserts an invention crucial for compliance with a technical standard.
D Patent thicket 4 an intricate network of overlapping patent rights

1
A-4, B-1, C-2, D-3
2
A-3, B-2, C-1, D-4
3
A-3, B-1, C-4, D-2
4
A-3, B-1, C-2, D-4
5
Question Not Attempted

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