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Level 15 - LGILEBEI
The answer to this puzzle is:
Words: LEGIBLE, GILLIE, BILLIE, GLEBE, BELIE, BILGE, GLIB, BILE, GLEE, GILL, GIBE, LEE, LEI, GEE, LIB
Bonus words:
LEGIBLE, GILLIE, BILLIE, GLEBE, BELIE, BILGE, GLIB, BILE, GLEE, GILL, GIBE, LEE, LEI, GEE, LIB