慨 GAI - regret, lament
描 BYOU, ega(ku) - draw, paint, sketch, depict
匹 HITSU, hiki - compare, alone, counter for animals
代 DAI, ka(waru), ka(eru), yo, shiro - era, price, change
凝 GYOU, ko(ru), ko(rasu) - grow stiff, be engrossed
Add a single stroke to each of these to make another character.
概 GAI - general
猫 neko - cat
四 SHI, yo(tsu), yo(ttsu), yo, yon - four
伐 BATSU - attack, cut down
擬 GI - imitate