流Flow. The flow of water, etc. To spread in the world. To send to a distant place. To wander. To end without taking shape. To deviate from the original purpose. A unit of flag. Technique. Style. Companions.
唯That's it. Just one. Only. A word expressing limitation or emphasis. Reply. A reply of acceptance that is answered immediately.
留Stays. To hold in place. To be still and unmoving.
稲Rice. An annual plant of the grass family and the most important agricultural crop in Japan. It is a metaphor for humble things, as the ears droop when they bear fruit.