Add lab session 4

Handed in on 10 Nov 2020.

Change-Id: Iac2b326e564a415d56c927b1900856d55fd6b9ed
diff --git a/p4/data/mesura3.dat b/p4/data/mesura3.dat
new file mode 100644
index 0000000..ae33d45
--- /dev/null
+++ b/p4/data/mesura3.dat
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