In a box which has length $L$, there are 3 distinguishable particles which have same mass $m$ and 1/2 spin.
When one is in search for lowest energy level and degeneracies, I personally think one must consider the Pauli exclusion principle.
So the lowest level has two particles (up and down) have ground state energy level and 1st excited state particle (regardless of up and down).
But many solutions say all the particles are in ground state.
2x2x2 = 8 degeneracies from 3up-down degrees of freedom exist.
In this case, the Pauli exclusion principle should not be considered? why isn't the principle needed?