| http://www.w3.org/ns/prov#value | - Depending on local conditions, such as availability and price of gaseous fuel, quality of uncondensable gases obtainable from the specific kind of tar sand being heated, etc., it may be perferable to use the calories of the sand coke for heating, e.g. in the following way: The triangular pattern as set forth in Figure 3 also shows a hexagonal pattern by combining 6 triangles with a common corner.
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