Give $3$ practical example for the pseudo$-$code given below;

$```$

persistent: seq, an action sequence, initially empty

state, some description of the current world state

goal, a goal, initially null

problem, a problem formulation

state $\backslash$leftarrow UPDATE$-$STATE$($state$,$ percept$)$

if seq is empty then

goal $\backslash$leftarrow FORMULATE$-$GOAL$($state$)$

problem $\}\backslash$leftarrow$\backslash$mathrm$\{$ FORMULATE$-$PROBLEM$($state$,$goal$)$

seq $\backslash$leftarrow SEARCH$($problem$)$

if seq $=$ failure then return a null action

action $\backslash$leftarrow$-$FIRST$($seq$)$

seq $\}\backslash$leftarrow$\backslash$mathrm$\{$ REST$($seq$)$

return action

$```$

function SIMPLE$-$PROBLEM$-$SOLVING$-$AGENT$($percept$)$ returns an action