Pentomino Box Packing : Solid Y

7 solutions.

1. UXIIIIIV | XXXYYYYV | UXNNYVVV
   UZZWLLLL | UTTTLPPP | UFFNNNPP
   ..ZW.... | ..TW.... | ..FF....
   ..ZZ.... | ..TW.... | ..FW....

2. PVVVXTTT | PVYXXXTL | PVNNXUTU
   PZZIIIII | PYYFLLLL | NNNWWUUU
   ..ZF.... | ..YF.... | ..WW....
   ..ZZ.... | ..YF.... | ..WF....

3. ZWWYXUFU | WWTXXXFF | WNNNXFFL
   ZZZYYUUU | TTTIIIII | NNVPLLLL
   ..ZY.... | ..TP.... | ..VP....
   ..VY.... | ..VP.... | ..VP....

4. ZWWYFUXU | WWTFFXXX | WNNNFFXL
   ZZZYYUUU | TTTIIIII | NNVPLLLL
   ..ZY.... | ..TP.... | ..VP....
   ..VY.... | ..VP.... | ..VP....

5. VNNNLLLL | VIIIIIYL | VVVFYYYY
   NNZWWXUU | PPZTXXXU | PPPFFXUU
   ..WW.... | ..ZT.... | ..FF....
   ..WT.... | ..ZT.... | ..ZT....

6. VNNNYYYY | VIIIIIYL | VVVFLLLL
   NNZWWXUU | PPZTXXXU | PPPFFXUU
   ..WW.... | ..ZT.... | ..FF....
   ..WT.... | ..ZT.... | ..ZT....

7. PLLLLVVV | PYIIIIIV | YYYYNNNV
   PZZWLXUU | PTTTXXXU | PFFNNXUU
   ..ZW.... | ..TW.... | ..FF....
   ..ZZ.... | ..TW.... | ..FW....