Tools and weapons
This group moves from hand-held weapons—刀 “sword,” 弓 “bow,” 矢 “arrow,” and 矛 “halberd”—to boats and equipment. Picture a storehouse of tools, then notice that 艦 and 艇 are ships while 斤 and 屯 have other meanings too.
刀 has 2 strokes, 弓 3, 矢 5, 刃 3, and 艦 21; keep the short forms distinct, especially 刀 and 刃.