one fable-low hijack cell
pair sink / source
envelope en_arrow
ordering BA
effort low
English with arrow '→' — '{X} → {Y}'
verdictpicked source (second-offered)
· classifierB
· tiernone
response (200 chars)
**sink → source** — these are classic opposites (duals) across many fields:
- **Electronics:** a current *sink* absorbs current; a *source* supplies it
- **Graph theory / flow networks:** the *source
neighbors