F{char} To [count]'th occurrence of {char} to the left.
1 find char c (F)
2 find char c with count (2F)
3 find char c using repeat and count (2;)
4 find char c in reverse direction with count (^2,)
5 find consecutive char ### with count (2F)
6 find consecutive char ### using repeat (;;)
7 find consecutive char ### using repeat and count (2;)
8 find consecutive char ### in reverse direction with count ($2,)
9 delete # found (d;)
10 delete not found (d;)
11 delete invalid count # (d2;)
12 till æ unicode
13 till space
14 till 	 tab