shells scripts

Consider the following shell script. Explain what lines 4, 6,7 and 9 do . What does the script output on the screen?
#!/bin/sh
MyVar=”.Blue/Green/Red/Yellow.”
echo ${MyVar#*Green}
val=${MyVar%%/*}
echo $val
MyVar=${MyVar#$val/}
val=${MyVar%%/*}
echo $val
MyVar=${MyVar#$val/}
val=${MyVar%%/*}
echo $val
MyVar=${MyVar#$val/}
val=${MyVar%%/*}
echo $val

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