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| The ''concatenation'' of the <math>k\!</math> strings <math>s_j,\!</math> for <math>j = 1 \ldots k,\!</math> is the string of the form <math>s_1 \cdot \ldots \cdot s_k.\!</math>
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| The ''concatenation'' of the <math>k\!</math> strings <math>s_j, j = 1 \ldots k,\!</math> is the string of the form <math>s_1 \cdot \ldots \cdot s_k.\!</math>
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| valign="top" | 2.
| valign="top" | 2.
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| The ''surcatenation'' of <math>k\!</math> strings <math>s_j,\!</math> for <math>j = 1 \ldots k,\!</math> is the string of the form <math>^{\backprime\backprime} \, \operatorname{(} \, ^{\prime\prime} \, \cdot s_1 \cdot \, ^{\backprime\backprime} \, \operatorname{,} \, ^{\prime\prime} \, \cdot \ldots \cdot \, ^{\backprime\backprime} \, \operatorname{,} \, ^{\prime\prime} \, \cdot s_k \cdot \, ^{\backprime\backprime} \, \operatorname{)} \, ^{\prime\prime}.</math>
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| The ''surcatenation'' of the <math>k\!</math> strings <math>s_j, j = 1 \ldots k,\!</math> is the string of the form <math>^{\backprime\backprime} \, \operatorname{(} \, ^{\prime\prime} \, \cdot s_1 \cdot \, ^{\backprime\backprime} \, \operatorname{,} \, ^{\prime\prime} \, \cdot \ldots \cdot \, ^{\backprime\backprime} \, \operatorname{,} \, ^{\prime\prime} \, \cdot s_k \cdot \, ^{\backprime\backprime} \, \operatorname{)} \, ^{\prime\prime}.</math>
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