implement ping-pong instruction
implement ping-pong instruction

hozhu123/tenshi,jessicakam/tenshi,SamboyKirk/tenshi,JaronArmiger/tenshi,SamboyKirk/tenshi,cduck/tenshi,jessicakam/tenshi,jessicakam/tenshi,cduck/tenshi,jarzofjam/tenshi,cduck/tenshi,pioneers/tenshi,jarzofjam/tenshi,cduck/tenshi,hozhu123/tenshi,zentner-kyle/tenshi-old,JaronArmiger/tenshi,hozhu123/tenshi,jarzofjam/tenshi,abhishyantkhare/tenshi,zentner-kyle/tenshi-old,cduck/tenshi,zentner-kyle/tenshi-old,chuen0630/tenshi,jarzofjam/tenshi,jessicakam/tenshi,jessicakam/tenshi,abhishyantkhare/tenshi,pioneers/tenshi,chuen0630/tenshi,tobinsarah/tenshi,SamboyKirk/tenshi,hozhu123/tenshi,pioneers/tenshi,jessicakam/tenshi,tobinsarah/tenshi,abhishyantkhare/tenshi,JaronArmiger/tenshi,tobinsarah/tenshi,hozhu123/tenshi,JaronArmiger/tenshi,SamboyKirk/tenshi,chuen0630/tenshi,pioneers/tenshi,hozhu123/tenshi,tobinsarah/tenshi,cduck/tenshi,JaronArmiger/tenshi,hozhu123/tenshi,jarzofjam/tenshi,jarzofjam/tenshi,jessicakam/tenshi,zentner-kyle/tenshi-old,pioneers/tenshi,chuen0630/tenshi,tobinsarah/tenshi,zentner-kyle/tenshi-old,jarzofjam/tenshi,cduck/tenshi,SamboyKirk/tenshi,pioneers/tenshi,tobinsarah/tenshi,chuen0630/tenshi,abhishyantkhare/tenshi,abhishyantkhare/tenshi,abhishyantkhare/tenshi,pioneers/tenshi,SamboyKirk/tenshi,SamboyKirk/tenshi,tobinsarah/tenshi,zentner-kyle/tenshi-old,JaronArmiger/tenshi,chuen0630/tenshi,JaronArmiger/tenshi,chuen0630/tenshi,abhishyantkhare/tenshi