1934. What character can be added to both of these characters to give other characters? 弓_ -> _⼽

弓  KYUU, yumi - archery bow

⼽  The "Hoko" radical - spear, weapon

Add 単:弓+単 単+⼽  

単  TAN - single, simple

弾  DAN, tama , hazu(mu), hi(ku) - bullet, bounce, play (piano)

戦  SEN, tataka(u), ikusa - war, battle, fight