muscles of leg

Muscles of Leg (Superficialh1bdude103-23 02:00 PMI also read somwhere that if you are not sure regarding your A#, then you can also leave it blank. I have one more problem. I lost this Expired EAD card during moving and now i only have its Front copy which i am going to submit with my I-765 form. will it be any problem submitting only front copy of the Previous EAD because they are requesting