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+Some function to generate v4 uuids
+==================================
+
+Generate a random uuid:
+
+	1> UUID = guid:v4().
+	<<254,194,254,188,1,12,79,173,84,118,109,153,143,115,228,127>>
+
+Convert to text representation:
+
+	2> guid:unparse(UUID).       
+ 	"0ee31c01-26cc-43f1-a0f9-b52c6de7fcf7"
+
+Check it's version:
+
+	3> guid:version(UUID).
+	4
+
+Generate text representation drectly:
+
+	4> guid:v4string().
+	"68718f41-06ff-49a8-8283-00582b2d5269"
+
+