iceberyllium
+1 -1 +2 ob2 -2 -3'' -3 | +4 -4 +5 -5 +6 -6 -7 | +7 -8 +8 -9 +9 -10 +10' | +10 +10' -10 +9 -9 +8 -8 | +7 -7 -6 +6 -5 +5 -4 | +4 -3 -3'' -2 ob2 +2 -1 | +1