I just got to the word 先回り - さきまわり. It says I should have learned already the meaning さき for 先 but I sure cannot recall to have learned it in any other word so far. I’ve only learned せん & まず.
As I’ve just stumbled across this, I thought I point it out, since I haven’t figured a good way yet for myself to remember this word best.
Keep up the good work.