Assertion: blackbird's egg | /r/CapableOf | weigh 7.2 grammes
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Source sentences:
text: (usually four) bluish-green eggs marked with reddish-brown blotches, heaviest at the larger end; the eggs of nominate T. merula are 2.9×2.1 centimetres (1.14×0.93 in) in size and weigh 7.2 grammes (0.25 oz), of which 6% is shell.