Revision f25329f0-153a-441d-bb9c-e889a48de65d - Code Golf Stack Exchange

# [C (gcc)], 137 bytes

<!-- language-all: lang-c -->

 #define r rand()
 m;b;q(){m=r;m&30||q();}f(){for(q(b=5+r%4*5);--b;)printf(b%5?m&1<<b%5?"%c%c":"--":":"+!q(),"WRSC"[r%4],"rugbywcp"[r%8]);}

[Try it online!][TIO-kst444f9]

[C (gcc)]: https://gcc.gnu.org/
[TIO-kst444f9]: https://tio.run/##HU5NC4IwAL37K9ZC2dKBUUI4pUP/oA4dwoObTgZt6TQk1L/eml0e7z14H5w0nFu7rWohdQ0MMKWuEPYUZbRDeFK5oSo4xPPsFF2Es8TLoA6xPAmNf9wlmBLCKG6N1INAzE/OKthn2Uqgz30OU0iIgxSGG9cRwfv1doEPly0iaN4N@4y8XfWpcANWlVIjDCYPgP7/ZZCqRjHG1DlunnqL/XLxLJvekvEH "C (gcc) – Try It Online"
-5 bytes thanks ceilingcat!