Draw a timeline diagram for the sliding window algorithm with $SWS=RWS=2$ frames for

the following situations. Use a timeout interval of about $4$xRTT$.(20$ points$)$

a$.$ Only frame $1$ is lost $($Draw until ACK $6)(10$ points$)$

b$.$ Frames $3,4$ are lost $($Draw until ACK $6)(10$ points$)$