If you have tetrahedral model (AX2Y2), with center atom (A), atoms (X), and atoms (Y), how many distinct/unique tetrahedral molecules (isomers) can you create by rearranging the X and Y atoms? Draw all possible arrangements.

THE MOLECULE IS NOT CHIRAL SO WE WILL NOT GET IT'S ENANTIOMER OR MIRROR IMAGES.
If you have tetrahedral model (AX2Y2), with center atom (A), atoms (X), and atoms (Y), how...