Assertion: charcoal | /r/CapableOf | make at higher temperatures
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Source sentences:
text: Charcoal made at 300 °C (572 °F) is brown, soft and friable, and readily inflames at 380 °C (716 °F); made at higher temperatures it is hard and brittle, and does not fire until heated to about 700 °C (1,292 °F).