llvm dev - Apr 2020 - LowRISC RISC-V backend Coding Lab tutorial has gone missing

Alex Bradbury's step by step backend tutorial for RISC-V from his 2018
Coding Lab has gone missing from LowRISC. I've searched high and low but I
can't find a mirror. Does anyone know where to find it or could they send
me a tarball?

https://www.lowrisc.org/llvm/devmtg18/

gives "Ooops... Page not found!"

thanks,

Chris
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