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This seems a small price to pay for relieving the user of the burden of correcting damage done by a technically legal but senseless request. 32 Chapter 3 Interrupting While the Assistant is active, you may inter- the Assistant rupt it at any time, causing it to become attentive again. 9 Error There are several conditions under which a Conditions request cannot be satisfied: I. if the request cannot be understood or is inconsistent with what is known, 2. if the Assistant asks you to confirm a request and you do not comply, or 3.

The use of the interrupt to terminate continuous text input is consistent with the general semantics of interrupts and allows for easy input of empty (blank) lines, by far the most frequently entered line of text. Empty lines can be entered by simply typing a carriage return. 34. The second form of the INSERT request allows quick insertion of a short text fragment as a line. When combined with the margin symbol, this feature also allows rapid insertion of several short lines of text. 56 Chapter 3 Changing Text In order t o change a piece of text in one Within a Line or more lines you say: MAKE ( n / A L L ) =,ext= =new-text= This request is different from all the previous requests in that it operates on text ~ithin lines rather than whole lines themselves.

N E X T ALL The Assistant moves the current llne forward to the Zast line in the file. 4. NEXT = t e x t = The Assistant moves the current line forward to the next line containing an occurrence 5. of the specified text. NEXT n = t e x t = The Assistant moves the current line forward to the "n-th" line containing an occurrence 6. of the specified text. 2 8 NEXT ALL = t e x t = The Assistant moves the current line forward to the last line containing an occurrence of the specified text. The A n n o t a t e d A s s i s t a n t 51 In our opinion, most editors based on the "current line" concept suffer from the drawback that the user must mentally keep track of what the current line is.

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