actor1: Military Forces of Afghanistan (2014-2021)
actor2: Military Forces of Pakistan (2013-2018)
notes: Pakistan and Afghan troops exchanged heavy artillery at the main Khyber Pass border crossing on Wednesday, the Pakistan Army said, an escalation after days of clashes that have killed four people and stranded thousands on both sides.
target_text: actor1: Military Forces of Afghanistan (2014-2021), actor2: Military Forces of Pakistan (2013-2018)