Packet tracer help please. I cannot get more than $4$ pcs to connect to the switch

Create the following topology in Packet Tracer

Completed $$

The first thing we will do is show the MAC address on the switch. As you would expect the MAC address table should be empty as no traffic has gone through it$.$ Click on the switch, go to the CLI tab $($hit return, maybe more than once$)$ and they on the command 'show mac address$-$table

$3.$ Go into simulation mode and make sure that APR and ICMP are the only protocols enabled. We will now a packet from PC$2$ to PC$5.$ As we did in lab $5,$ hit the capture button and see the packet travel. The switch will do a broadcast that requested by the ARP. PC$5$ will accept it$.$

$4.$ Hit capture forward and this time PC$5$ will send back a reply. Notice that the reply only goes put one port from the switch and PC$2$ accepts the packet.

$5.$ Now check the MAC address table on the switch and the ARP table on PC$2$

$6.$ Now ping PC$5$ again from PC$2$ and see how the switch handles the ping. The switch delivers the packet direct to the PC and no broadcast is required.

$7.$ As a final step, clear the ARP cache $($table$)$ on PC$2$ and then once again ping PC$5$ from PC$2$ and see what happens......