Nothing
x cannot be independent if scales are not free.
y cannot be independent if scales are not free.
x cannot have free space if axes are independent.
i Overriding `space` for x to "FALSE".
y cannot have free space if axes are independent.
i Overriding `space` for y to "FALSE".
x-axes must be labelled if they are independent.
i Overriding `remove_labels` for x to "FALSE".
y-axes must be labelled if they are independent.
i Overriding `remove_labels` for y to "FALSE".
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