F 0

#first iteration
loop N
 show
 show
 inc F 1
endloop

loop N
 show
 show
 dec F 1
endloop

#second iteration
loop N
 show
 show
 inc F 1
endloop

loop N
 show
 show
 dec F 1
endloop

#third iteration
loop N
 show
 show
 inc F 1
endloop

loop N
 show
 show
 dec F 1
endloop

endscript
