Yi Jing, Oracle of the Moon

Zhèn-Kan, Thunder-Water

  Zhèn meets Kan. The development of seeds is often held back by cold or fear, but Kan shelters the seeds and Zhèn makes them germinate. When Thunder shakes the water up, it evaporates into mist, clouds and rain. Every spring and in every new start, Thunder and Water together create a new cycle of life. Without them there will be successions but very few new creations.
  When Zhèn meets Kăn, Thunder has access to the formlessness and dare of Water. Then Zhèn moves without any restriction.

This is the short answer - click for the complete one (with 'your' helpers).

  About the 3 lines of the trigrams and the helpers:
  Each line, active or at rest, summons one of the 8 trigrams as a Helper. For an activated line: telling you what you need - or about a problem area or something to avoid.
  For a stationary line: this is what you already have or do or what you don't need. Often we just need a reminder of our abilities. Or it could be what you wish or fear - but will not happen.
  Active lines are the helpers to change things, they listen to intentions, which can come from you, surroundings, or fate. Stationary helpers are part of the core meaning, they are your soul talking, but they also see the impossibilities or what is lacking at the moment. They reinforce the overall power of a reading.