Classification of subspaces in $${{\mathbb{F}}^2\otimes {\mathbb{F}}^3}$$ F 2 ⊗ F 3 and orbits in $${{\mathbb{F}}^2\otimes{\mathbb{F}}^3 \otimes {\mathbb{F}}^r}$$ F 2 ⊗ F 3 ⊗ F r