import logic

example {a b c : Prop} : a → b → c → a ∧ b :=
begin
  intros [Ha, Hb, Hc],
  clear Hc,
  clear c,
  apply (and.intro Ha Hb),
end

example {a b c : Prop} : a → b → c → c ∧ b :=
begin
  intros [Ha, Hb, Hc],
  clear Ha,
  clear a,
  apply (and.intro Hc Hb),
end