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Beside constants PI and E, operators
+, -, *, /, and %
the following functions can be used in expression:
<![CDATA[
abs, acos, asin, atan, ceil, cos,
exp, floor, log, max, min, pow,
random, round, sin, sqrt, tan
]]>
Also the following graph invariants can be used in expression:
N = number of vertices
M = number of edges
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