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I have installed MPI on my 3 node raspberry-pi 3B+ cluster and whenever I run any command I get 12 replies, 4 from each node, as an example, when I run mpirun -machinefile machine-file hostname I get the output

pi0
pi0
pi0
pi0
pi1
pi1
pi1
pi1
pi2
pi2
pi2
pi2

can anyone tell me what may be causing this and/or how to fix it?

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