Alternate bars in different time signatures

[Raphael Mankin]

I have music with alternate bars in 3/4 and 6/8. The usual way to 
indicate this is to  put both  time signatures at the start, but  I can 
find  no way to do this.

I have tried "\time 3/4 <> \time 6/8", but I only get the last one.
Note, this  is not a compound time of 3/4+6/8, but alternating time 
signatures.

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