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Annotation of 42BSD/usr.lib/learn/morefiles/L6.1e, revision 1.1

1.1     ! root        1: #print
        !             2: By the way, you can also use "grep" to print out ___all ___but
        !             3: those lines that contain occurrences of a pattern:
        !             4:   grep -v pat files...
        !             5: prints all the lines in files... that don't contain
        !             6: any "pat".
        !             7: How many of the lines in "bio*" don't contain "the"?
        !             8: Type "answer N", where N is the number of lines.
        !             9: #create bio1
        !            10:    Roughly speaking, your eye is made of three balls, or layers,
        !            11: fitted tightly one inside the other.  the tough white outermost
        !            12: layer's function is to protect the others.  the middle layer gives
        !            13: the front of your eye its brown, gray, or blue color.  The inside
        !            14: of this layer is dark and full of tiny blood vessels.  The innermost
        !            15: layer, called the retina, is made of very special nerve cells that
        !            16: are sensitive to light and color.  A nerve cord connects the retina
        !            17: of each eye to your brain.
        !            18:    The front of your eye's two outer layers (the cornea) is clear,
        !            19: or open, to let light enter.
        !            20: #create bio2
        !            21:    We do not know when life began on the earth, and it seems likely
        !            22: that the answer to this question will remain forever hidden from us.
        !            23: What we do know is that it was some 500 million years ago when the
        !            24: plants and animals of early geologic history had reached a stage of
        !            25: development where they produced hard parts capable of being preserved
        !            26: as fossils.
        !            27:    At this distant date there seemingly was no land life; all life
        !            28: was in the sea.  Moreover, there were no vertebrates, or backboned
        !            29: animals, living -- at least none of sufficient complexity that they
        !            30: left hard structures to be preserved in the form of fossils.
        !            31: #copyin
        !            32: #user
        !            33: #uncopyin
        !            34: #match 6
        !            35: #log
        !            36: #next
        !            37: 7.1a 10
        !            38: 6.2e 5

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