Пронумеруйте слова в порядке их расположения в словаре, например, stay(3),
stand(2), want(4), apple(1):

air, are, motion, water, very, we, already, heat, use, again,
work, man, move, same, heat, have, soon, way, state, gas, mixture

Air(2), are(4), motion(11), water(18), very(17), we(20), already(3), heat(7), use(16), again(1),
work(21), man(9), move(12), same(13), heat(8), have(6), soon(14), way(19), state(15), gas(5), mixture(10)

heat - 2 раза в тексте (7) (8)

1 again

2 air

3 already

4 are

5 gas

6 have

7 heat

8 man

9 mixture

10 motion

11 move

12 same

13 soon

14 state

15 use

16 very

17 water

18 way

19 we

20 work

heat повторяется 2 раза