| http://www.w3.org/ns/prov#value | - In certain embodiments, the stepped side walls 28, 30, 32 are configured to: (i) allow a free jet of injected cracking material, such as superheated steam, natural gas, carbon dioxide, or other gas, to travel generally along and within the conical jet path C generated by the injection passage 15 along the axis B of the interior reactor chamber 16, while (ii) reducing the size or involvement of bac
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