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try.

    try. B0 catch. B1 catchd. B2 catcht. B3 end.
The try/catch control structure may contain one or more distinct occurrences of`catch. catchd. catcht.` ,`` in any order. For example:
    try. B0 catch. B1 end.
    try. B0 catcht. B1 catchd. B2 end.
    try. B0 catcht. B1 catch. B2 catchd. B3 end.
The`B0` block is executed and: •`catch.` catches errors, whatever the setting of the debug flag`13!:0` •`catchd.` catches errors, but only if the debug flag is 0 •`catcht.` catches a`throw.`

For example:

    f=: 4 : 0
     try.
      try. 3+y. catch. *:x. end.
     catch.
      'x and y are both bad'
     end.
    )

       13 f 7
    10

       13 f 'primogeniture'
    169

       'sui' f 'generis'
    x and y are both bad

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