..
there is nothing to do, we can skip 3 chars..ff
, .f.
and .f
we can't decide yet to drop water and skip the first char.f.
we must drop water urgently to not forget it and skip the first char.ff.
, f.f
and fff
all we can do is drop water and step ahead three chars.f.f
, fff
, f
or ff
. This idea can be formalized as regular expression / regular language with Geekbench 4 4 11.