Instance variable: $-$ Blobs identified by this blob finder, $\_$blobs $($list of Blob objects$).$ BlobFinder$()-$ Initialize blobs to an empty list. $-$ Create a $2$D list of booleans called marked, having the same dimensions as pic. $-$ Enumerate the pixels of pic, and for each pixel $($i$,$ j$)$: $-$ create a Blob object called blob; $-$ call $\_$findBlob$()$ with the appropriate arguments; and $-$ add blob to blobs if it has a non$-$zero mass. bf$.\_$findBlob$()-$ Base case: return if pixel $($i$,$ j$)$ is out of bounds, or if it is marked, or if its luminance $($use the luminance$()$ method from Color for this$)$ is less than tau. $-$ Mark the pixel $($i$,$ j$).-$ Add the pixel $($i$,$ j$)$ to the blob blob. $-$ Recursively call $\_$findBlob$()$ on the N$,$ E$,$ W$,$ and S pixels. bf$.$getBeads$($pixels$)-$ Return a list of blobs from blobs that have a mass $$ pixels.