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bc9990d1123499f5ba2ecf7d260534f6d648853c: $$
\text{hot air}
aedfde1109754aba7473a4fe69f18cdc59e8a522: $$
\text{cold water}
67ee70a1cd953d0dd0f8db312d68f818bd9b480c: $$
d_\text{in}
486a9777747f6ea9eeebd54a0b5a78de6dbd10e0: $$
L_1