--- a/.hgtags Sun Dec 12 20:37:38 2021 +0100
+++ b/.hgtags Sun Dec 12 20:38:47 2021 +0100
@@ -38,10 +38,4 @@
83774d669b5181fb28d19d7a0219fbf6c6d38aab Isabelle2019
abf3e80bd815c2c062b02c78b256f7ba27481380 Isabelle2020
7e2a9a8c2b85f10d81f3be433878fe51fa13eb6f Isabelle2021
-fedc0b659881c3768f7209f64d9d0213aac0941d Isabelle2021-1-RC0
-81cc8f2ea9e720a68f0ba96e2b8d8e98a5ff3152 Isabelle2021-1-RC1
-b92b5a57521b27cf592b835caa8e8d73e05070d2 Isabelle2021-1-RC2
-2b212c8138a57096487461fa353386f753ff7a11 Isabelle2021-1-RC3
-2336356d4180b948eb9070f3f9f8986cda7e8f76 Isabelle2021-1-RC4
-8baf2e8b16e2218edaeb6dee402b21f97a49a505 Isabelle2021-1-RC5
c2a2be496f35aa1a6072393aebfdb1b85c9f2e9e Isabelle2021-1