Σ(i³) = (Σi)² on Nostr: npub17nmsn…xdm57 Nice! I completed #Celtix 1 using 20 walls. npub17nmsnlj395asphryxpsmngp7xtyp2egndrcyycu58kpnp646hapsqxdm57 (npub17nm…dm57) Nice!I completed #Celtix 1 using 20 walls.http://www.andrewt.net/puzzles/celtix?=1