fromXconsXn__fromsXfirst0ZnilfirstsXconsYZconsYn__firstXactivateZsel0consXZXselsXconsYZselXactivateZfromXn__fromXfirstX1X2n__firstX1X2activaten__fromXfromXactivaten__firstX1X2firstX1X2activateXXfrom1cons2n__from1s1first200nil0n__first2activate1sel2FULL./TRS/TRCSR/Ex1_Luc02b_Z.trs