Assertion: bottle's line | /r/HasProperty | a common bottle base feature
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Source sentences:
text: The line between a mamelon and an embossed dot in the middle of an indented base (a common bottle base feature) is vague, although a mamelon would be more protrusive than a typical embossed dot, though both are formed the same way (by molding); mamelons are uncommonly encountered on free-blown and dip-molded bottles (Jones 1986).