some fixes in the README

README.md

@@ -13,15 +13,15 @@ Usage
     make
     echo "0 1\n0 2\n1 0\n1 3\n2 0\n3 0\n3 1\n3 2" | java de.normalisiert.utils.graphs.TestCycles 4
 
-First argument is the number of vertices. Subsequent arguments are ordered
+First argument is the number of vertices. Ordered pairs of space separated
-pairs of comma separated vertices that make up the directed edges of the
+vertices are given via standard input and make up the directed edges of the
 graph.
 
 DOT file input
 --------------
 
 For simplicity, there is no DOT file parser included but the following allows
-to create a suitable argument string for simple DOT graphs.
+to create a suitable argument string and standard input for simple DOT graphs.
 
 Given a DOT file of a simple (no labels, colors, styles, only pairs of
 vertices...) directed graph, the following lines generate the number of