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Difference between the various projects within an example in the nRF51 SDKs

There are the following projects under the Health Thermometer example for Keil

What is the difference between them when trying to install on the nRF51 DK? I could not find any documentation or read me describing what these are for.

Which should I use when I desperately want to get something to work on the DK? So far I have had no luck with the s110 project. Should I be using the UART?

s110
ser_s110_hci
ser_s110_spi
ser_s110_uart

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