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Level 13 - LNDNGEI
The answer to this puzzle is:
Words: GINNED, LINDEN, DINGLE, ENGILD, GELID, DEIGN, INGLE, DINGE, LINEN, INNED, GELD, GIED, LINN, GLED, GILD, GIEN, DEIL, DENI, DIEL, DING, DELI, DINE, LIEN, GLEN, LIED, LING, IDLE, LED, INN, END, LEI, GIN, LIN, DIN, GEN, ENG, LID, NIL, ELD, DEL
Bonus words:
GINNED, LINDEN, DINGLE, ENGILD, GELID, DEIGN, INGLE, DINGE, LINEN, INNED, GELD, GIED, LINN, GLED, GILD, GIEN, DEIL, DENI, DIEL, DING, DELI, DINE, LIEN, GLEN, LIED, LING, IDLE, LED, INN, END, LEI, GIN, LIN, DIN, GEN, ENG, LID, NIL, ELD, DEL