IMPL: find_sequence() looks like done
IMPL: return
FIXUP: syntax fixes
FIXUP: fixing
FIXUP: fixing
DEBUG: debug
Revert "DEBUG: debug"

This reverts commit 01fa29da1ae9b4ed6822cec7d19421c15306ba7c.
TEST: add test for linear case
FIXUP: fix return
FIXUP: really fix return
FIXUP: fix termination issue in case of inner merges
DOC: ahash --> hash
IMPL: support for throughs
FIX: fix throughts implementation
IMPL: build todo with inner merges
FIX: fixing resolution
FIXUP: syntax fix
TEST: add test for inner merge, which fails (???)
TEST: resolution fails in the simplest diamond case - fix!