| http://www.w3.org/ns/prov#value | - Alternatively, the hardening step may include heating the liquid, such as by bringing the liquid to between about 100??? C. to 150??? C., and preferably to about 120??? C. On the other hand, the hardening step may include mixing a plurality of mutually reactive materials to form the liquid during or immediately before the introducing step such that the liquid cures by reaction of the materials.
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