Each of these phrases can be reworded into 2 words, one word is another word without core (middle letter). For example "Engrave the part of geological formation" contains "carve" and "cave". The core-less word can be at the front too, The eighteen phrases which have same properties are :
- something that can smell the disturbance
- unpleasant smell and sour
- varieties of children
- moved out the survived
- famines and deceases
- sun rises rapidly
- inside a hotel
- sneer the leprous man
- spear the thread
- northern Americans noisy talks
- bounded fatigue
- append promotion
- immature insect, molten rock
- type of skirts in a container
- sense judgment of conviction
- had been in debt
- so many warehouses
- right kind of tree
Once you have found each of these 18 phrases, look closely. There is something interesting hidden there. Find it.