(as) easy as A, B, C

See: as easy as pie

• Hard cheese!
• harden heart
• harden your heart
• hard feelings
• hard going
• Hard lines.
• hard-nosed
• hard nut
• hard nut to crack
• hard-on
• hard on heels
• hard on someone's heels
• hard on the heels of
• hard on the heels of something
• hard put to
• hard put to do something
• hard row to hoe
• hard sell
• hard stuff
• hard to swallow
• hard to take
• hark back to
• hark back to something
• harm a hair on head
• harm a hair on someone's head