Question: How do I display isotopes in 2D notation?

I have now used quite some time trying to find out how to display an isotope in Maple in 2D-math notation. In He-4-2 I want the nucleon (or mass) number 4 to stay as a superscript, but to the left of He, and the proton number 2 as a subscript also to the left of He. How can this be done in Maple in 2D-math notation? I hope someone can help.

Erik V.

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