Level 2
Level 4
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Gallium
Ga
Germanium
Ge
Arsenic
As
Selenium
Se
Bromine
Br
Krypton
Kr
Rubidium
Rb
Strontium
Sr
Yttrium
Y
Zirconium
Zr
Niobium
Nb
Molybdenum
Mo
Technetium
Tc
Ruthenium
Ru
Rhodium
Rh
