What we do need is a knowledge of coal's elemental analysis. In other words, we need to know only how much carbon, hydrogen, sulfur, oxygen and nitrogen there is in a given coal. A typical elemental analysis of a bituminous coal is as follows: 82% carbon, 5% hydrogen, 1% nitrogen, 3% sulfur, 9% oxygen.
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Make-based tools[edit] 1  GNU make, a widely used make implementation with a large set of extensions. 2  make, a classic Unix build tool.  mk, developed originally for Version 10 Unix and Plan 9, and ported to Unix as part of plan9port.