[
  "The sequence goes up. Find the difference between terms you know.",
  "From 2.1 to 2.7 is two steps of 0.3 each. From 3.0 to 3.6 is also two steps of 0.3. The step is 0.3.",
  "Add 0.3 to 2.1 to get 2.4. Add 0.3 to 3.0 to get 3.3."
]