Fix three letter commands issue

[AdaOrbit]

Found an issue while writing a test for alire-project/alire#2176

For a three letter commands the line

Relevant : constant Boolean := Min_Dist < Input'Length / 2 and Min_Dist < Distance;

Relevant : constant Boolean := Min_Dist < 3 / 2 and Min_Dist < Distance;

Relevant : constant Boolean := Min_Dist < 1 and Min_Dist < Distance;

would mean that Min_Dist would have to be 0 to be relevant. Meaning that it has to be written correctly. But there are too many three letter alire commands that should also be included.