If $L=\{a,b,c\},$ which are incomparable to each other, what will be the Hasse diagram in that case? Will the three points lie on the plane arbitrarily?
Also is there any necessity that elements must be put in the same orientation (I'm talking about left or right orientation) if I draw it separately? For example:
Can I shift the positions of $10$ and $15,$ or can I bring $20$ slightly down between $4$ and $15$ (obviously above $4$)?