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Using Single Mode SFPs with Multimode Fiber Cables

I'm trying to make sure I'm not gonna have any problems with the following setup:

I'm currently using 50 micron Multimode fiber cables with two 1000BASE-LX Single Mode 1310 nm SFP connectors on either end.  These are being used to trunk switches together.  Is it OK to mix the Single Mode and Multimode in this way?  I can ping across this set up with no issues and no apparently latency, and the trunk seems to be working fine (as far as tagging packets and such), but will I run into problems with this setup in the future?  CRC errors, that sort of thing?

Thanks in advance.
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