Two Processes One TLB

A fully associative TLB holds 4 entries and replaces LRU. Pages are 4 KiB. Two processes use the same virtual page numbers:

process	VPN	PFN
P1	10	100
P1	11	101
P2	10	170
P2	11	171

The TLB starts empty and the reference sequence is:

step	running	VPN
1	P1	10
2	P1	11
3	P2 (context switch)	10
4	P2	11
5	P1 (context switch)	10
6	P1	11

Compare two machines: machine F has no address space identifier and flushes the whole TLB on every context switch; machine A tags each entry with an ASID and never flushes. How many TLB misses does each take?