A block reference of the other drawing whose named block exists in this
drawing with other contents drew this drawing's definition in the red
group. The export now keeps this drawing's block only when both
drawings' blocks draw the same thing: the same objects, base point,
units, annotative and overlay flags and xref file, in the block and in
the blocks its references and multileaders use. Otherwise the other
drawing's block is copied under a free name (PART_2, PART_3, ...) and
its references point at the copy.
dotCooCoo
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