wait where was it I'm having trouble finding it as well
hey, only like 9 months late but here's he answer:
shape 5 can be made if you go down the middle hole but DONT jsut fall down in the liquid on the left side!
See that sideways S block arrangemengt with a single block on the top right of it?
which you can only reach by climbing in from the left side?
yeah between the single block and the S, go into the liquid there, do a 180, climb out that same hole.
when climbingout, do exactly those steps:
1 up, 2 right, 1 up.
you should now sit in that 2 shape above the single bloc with shape 5 unlocked :-)
now only shape 9, if it exists, left to find again and explain...