#   Kanji   Kanji Level 4  
588 やく 約 yaku some, about 1103
7312 やく 約 yaku about, approximately 1103
    約半分 yakuhanbun approximately half  
7320 やくそく 約束 yakusoku arrangement; promise (to meet in future) 1058 1103
    約定 yakujoo contract, agreement