9-9. One unit of A is composed of two units of B and three units of C. Each B is composed of one unit of F. C is made of one unit of D one unit of E and two units of F. Items A B C and D have 20 50 60 and 25 units of on-hand inventory. Items A B and C use lot-for-lot (L4L) as their lot-sizing technique while D E and F require multiples of 50 100 and 100 respectively to be purchased. B has scheduled receipts of 30 units in Period 1. No other scheduled receipts exist. Lead times are one period for Items A B and D and two periods for Items C E and F. Gross requirements for A are 20 units in Period 1 20 units in Period 2 60 units in Period 6 and 50 units in Period 8. Find the planned order releases for all items. (see the note in problem 5.)