Insert the words given in the snakes, one letter per square, so that no identical letters touch, not even diagonally. Each word should be used exactly once.

1. EIGHT FIVE FOUR NINE SEVEN TEN

2. ARIES GEMINI LEO LIBRA PISCES TAURUS VIRGO

3. ARGON BORON CARBON GOLD IRON OXYGEN SODIUM

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4. EARTH JUPITER MERCURY NEPTUNE PLUTO VENUS

5. BLUE BROWN GRAY PURPLE RED TAN VIOLET WHITE

6. AKITA BOXER HUSKY MALTESE POINTER SPANIEL

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7.

GINGER NUTMEG OREGANO PAPRIKA PARSLEY ROSEMARY TURMERIC

8.

APRICOT GRAPE LIME MANGO ORANGE PEACH PEAR PLUM TANGERINE

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The solutions are here.